Derivative Instruments - Gain (Loss) On Derivative Instruments (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
|
| Derivative Instruments, Gain (Loss) [Line Items] | |||
| Net gain (loss) on derivative instruments | $ (1,561) | $ 15,336 | $ 5,138 |