Annual report pursuant to Section 13 and 15(d)

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

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Derivative Instruments and Hedging Activities - Summary of Active Derivative Instruments (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
USD ($)
MMBTU
$ / MMBTU
Dec. 31, 2018
USD ($)
Interest Rate Swap October 2029 | Designated as Hedging Instrument    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative, term of contract 11 years  
Derivative, active interest rate swap 5.77%  
Initial Notional Amount ($) $ 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 2020 | Not Designated as Hedging Instrument    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative, term of contract 3 years  
Derivative, active interest rate swap 2.46%  
Initial Notional Amount ($) $ 17,100  
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 2020 - Contract 1 | Designated as Hedging Instrument    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative, term of contract 8 years  
Derivative, active interest rate swap 1.71%  
Initial Notional Amount ($) $ 9,665  
Interest Rate Swap - March 2020 - Contract 2 | Designated as Hedging Instrument    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivative, term of contract 8 years  
Derivative, active interest rate swap 1.71%  
Initial Notional Amount ($) $ 7,085  
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  
Commodity Contract - April 2020 | 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 2.68  
Initial notional amount, volume (in MMBtu) | MMBTU 437,004  
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  
Other liabilities | Interest make-whole provisions | Not Designated as Hedging Instrument    
Derivative Instruments, Gain (Loss) [Line Items]    
Fair Value ($) $ 918 $ 1,808