Derivatives - Derivative Gain (Loss) Recognized in Income Statement (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Effect of derivative instruments on results of operations
Interest expense	$ (104,681)	$ (93,328)	$ (88,760)
Accumulated Other Comprehensive Loss | Reclassification adjustments
Effect of derivative instruments on results of operations
Interest expense	$ 2,278