Quarterly report pursuant to Section 13 or 15(d)

Derivative Instruments and Hedging Strategies - Schedule of (Losses) Gains on Derivative Instruments not Designated as Hedging Instruments (Details)

v3.19.1
Derivative Instruments and Hedging Strategies - Schedule of (Losses) Gains on Derivative Instruments not Designated as Hedging Instruments (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Derivative [Line Items]    
Gains (losses) on derivative instruments $ (925) $ (11,516)
Embedded Derivative Financial Instruments    
Derivative [Line Items]    
Gains (losses) on derivative instruments $ (925) (12,159)
Interest Rate Swap    
Derivative [Line Items]    
Gains (losses) on derivative instruments   $ 643