Annual report pursuant to Section 13 and 15(d)

Derivative Instruments and Hedging Activities - Summary of Active Derivative Instruments (Details)

v3.20.4
Derivative Instruments and Hedging Activities - Summary of Active Derivative Instruments (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
MMBTU
$ / MMBTU
Interest Rate Swap October 2029 | Designated as Hedging Instrument  
Derivative Instruments, Gain (Loss) [Line Items]  
Derivative, term of contract 11 years
Derivative, active interest rate swap 5.77%
Initial Notional Amount ($) $ 9,200
Interest Rate Swap June 2033 | Designated as Hedging Instrument  
Derivative Instruments, Gain (Loss) [Line Items]  
Derivative, term of contract 15 years
Derivative, active interest rate swap 5.24%
Initial Notional Amount ($) $ 10,000
Interest Rate Swap - December 2027 | Designated as Hedging Instrument  
Derivative Instruments, Gain (Loss) [Line Items]  
Derivative, term of contract 10 years
Derivative, active interest rate swap 4.74%
Initial Notional Amount ($) $ 14,100
Interest Rate Swap - December 2038 | Designated as Hedging Instrument  
Derivative Instruments, Gain (Loss) [Line Items]  
Derivative, term of contract 15 years
Derivative, active interest rate swap 3.26%
Initial Notional Amount ($) $ 14,084
Interest Rate Swap - February 2023 | Designated as Hedging Instrument  
Derivative Instruments, Gain (Loss) [Line Items]  
Derivative, term of contract 7 years
Derivative, active interest rate swap 2.19%
Initial Notional Amount ($) $ 20,746
Interest Rate Swap - June 2028 - Contract 1 | Designated as Hedging Instrument  
Derivative Instruments, Gain (Loss) [Line Items]  
Derivative, term of contract 8 years
Derivative, active interest rate swap 3.70%
Initial Notional Amount ($) $ 14,643
Interest Rate Swap - June 2028 - Contract 2 | Designated as Hedging Instrument  
Derivative Instruments, Gain (Loss) [Line Items]  
Derivative, term of contract 8 years
Derivative, active interest rate swap 3.70%
Initial Notional Amount ($) $ 10,734
Interest Rate Swap - March 2033 - Contract 1 | Not Designated as Hedging Instrument  
Derivative Instruments, Gain (Loss) [Line Items]  
Derivative, term of contract 13 years
Derivative, active interest rate swap 0.93%
Initial Notional Amount ($) $ 9,505
Interest Rate Swap - March 2033 - Contract 2 | Not Designated as Hedging Instrument  
Derivative Instruments, Gain (Loss) [Line Items]  
Derivative, term of contract 13 years
Derivative, active interest rate swap 0.93%
Initial Notional Amount ($) $ 6,968
Interest Rate Swap - February 2021 | Designated as Hedging Instrument  
Derivative Instruments, Gain (Loss) [Line Items]  
Derivative, term of contract 15 years
Derivative, active interest rate swap 5.30%
Initial Notional Amount ($) $ 3,256
Interest Rate Swap - March 2024 | Designated as Hedging Instrument  
Derivative Instruments, Gain (Loss) [Line Items]  
Derivative, term of contract 15 years 6 months
Derivative, active interest rate swap 5.40%
Initial Notional Amount ($) $ 13,081
Interest Rate Swap - September 2023 | Not Designated as Hedging Instrument  
Derivative Instruments, Gain (Loss) [Line Items]  
Derivative, term of contract 2 years 9 months
Derivative, active interest rate swap 0.41%
Initial Notional Amount ($) $ 26,250
Commodity Contract - April 2021 | Not Designated as Hedging Instrument  
Derivative Instruments, Gain (Loss) [Line Items]  
Derivative, term of contract 1 year
Derivative, active commodity swap, fixed price (in usd per MMBtu) | $ / MMBTU 2.70
Initial notional amount, volume (in MMBtu) | MMBTU 435,810
Commodity Contract - June 2024 | Not Designated as Hedging Instrument  
Derivative Instruments, Gain (Loss) [Line Items]  
Derivative, term of contract 3 years 6 months
Derivative, active commodity swap, fixed price (in usd per MMBtu) | $ / MMBTU 2.65
Initial notional amount, volume (in MMBtu) | MMBTU 3,296,160
Make Whole Provision December2038 | Not Designated as Hedging Instrument | Other liabilities  
Derivative Instruments, Gain (Loss) [Line Items]  
Liability derivatives, fair value $ 174,289
Make Whole Provision April 2031 | Not Designated as Hedging Instrument | Other liabilities  
Derivative Instruments, Gain (Loss) [Line Items]  
Liability derivatives, fair value 73,113
Make Whole Provision February 2034 | Not Designated as Hedging Instrument | Other liabilities  
Derivative Instruments, Gain (Loss) [Line Items]  
Liability derivatives, fair value 104,696
Make Whole Provision December2027 | Not Designated as Hedging Instrument | Other liabilities  
Derivative Instruments, Gain (Loss) [Line Items]  
Liability derivatives, fair value $ 60,101