Quarterly report pursuant to Section 13 or 15(d)

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

v3.10.0.1
Derivative Instruments and Hedging Activities - Fair Value of Derivative Instruments on the Balance Sheet (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Designated | Interest rate swap instruments | Other assets    
Derivatives, Fair Value [Line Items]    
Asset derivatives $ 1,428 $ 233
Designated | Interest rate swap instruments | Other liabilities    
Derivatives, Fair Value [Line Items]    
Liability derivatives 1,548 3,529
Not Designated | Interest rate swap instruments | Other assets    
Derivatives, Fair Value [Line Items]    
Asset derivatives 66 0
Not Designated | Interest rate swap instruments | Other liabilities    
Derivatives, Fair Value [Line Items]    
Liability derivatives 0 0
Not Designated | Commodity swap contracts | Other assets    
Derivatives, Fair Value [Line Items]    
Asset derivatives 34 0
Not Designated | Commodity swap contracts | Other liabilities    
Derivatives, Fair Value [Line Items]    
Liability derivatives 46 0
Not Designated | Interest make-whole provisions | Other liabilities    
Derivatives, Fair Value [Line Items]    
Liability derivatives $ 1,488 $ 0