Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments and Hedging Activities - Fair Value of Derivative Instruments on the Balance Sheet (Details)

v3.19.2
Derivative Instruments and Hedging Activities - Fair Value of Derivative Instruments on the Balance Sheet (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Designated | Interest rate swap instruments | Other assets    
Derivatives, Fair Value [Line Items]    
Asset derivatives $ 72 $ 703
Designated | Interest rate swap instruments | Other liabilities    
Derivatives, Fair Value [Line Items]    
Liability derivatives 6,052 3,187
Not Designated | Interest rate swap instruments | Other assets    
Derivatives, Fair Value [Line Items]    
Asset derivatives 0 30
Not Designated | Interest rate swap instruments | Other liabilities    
Derivatives, Fair Value [Line Items]    
Liability derivatives 40 0
Not Designated | Commodity swap contracts | Other assets    
Derivatives, Fair Value [Line Items]    
Asset derivatives 136 33
Not Designated | Commodity swap contracts | Other liabilities    
Derivatives, Fair Value [Line Items]    
Liability derivatives 0 70
Not Designated | Interest make-whole provisions | Other liabilities    
Derivatives, Fair Value [Line Items]    
Liability derivatives $ 1,022 $ 1,808