Consolidated Statements of Comprehensive Income (Loss) (Parenthetical) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest expense	$ 183,751	$ 194,686	$ 221,398
Losses (earnings) from equity method investments	5,007	(13,015)	(77,349)
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Cash Flow Hedge
Interest expense	388	64	217
Gain on consolidation of equity method investment	(1,876)
Losses (earnings) from equity method investments	$ (20)	$ 304	$ 381