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Income Taxes - Components And Provisions (Details) - USD ($) $ in Thousands	3 Months Ended								6 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Components income/ (loss) before income taxes
United States													$ (511,165)	$ (180,245)	$ (281,009)
Foreign													9,691	18,792	10,457
Income/ (loss) before income taxes													(501,474)	(161,453)	(270,552)
Provision for federal, state, and foreign income taxes
Federal - Current													(1,308)	1,308	(722)
Federal - Deferred													(3,879)	(2,006)	(59,425)
State - Current													2,255	390	1,407
State - Deferred													(807)	2,339	(7,178)
Foreign - Current													5,770	3,435	5,794
Foreign - Deferred													5,611	2,887	(944)
Income tax expense (benefit)	$ 1,953	$ (3,769)	$ 4,738	$ 4,720	$ 3,442	$ (733)	$ 1,619	$ 4,025	$ 9,458	$ 5,644	$ 5,689	$ 4,911	$ 7,642	$ 8,353	$ (61,068)