Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 1,791,291	$ 1,843,623	$ 2,046,433
Other comprehensive income (loss) before reclassifications		(14,727)	26,481
Reclassification adjustment due to adoption of ASU 2016-01		(4,876)
Net other comprehensive income (loss)	(1,939)	(19,603)
Ending balance	1,614,759	1,791,291	1,843,623
Foreign currency translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(20,131)	(5,404)
Other comprehensive income (loss) before reclassifications	(1,939)	(14,727)
Reclassification adjustment due to adoption of ASU 2016-01		0
Net other comprehensive income (loss)	(1,939)	(14,727)
Ending balance	(22,070)	(20,131)	(5,404)
Unrealized gain (loss) in Accumulated OCI
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	0	4,876
Other comprehensive income (loss) before reclassifications		0
Reclassification adjustment due to adoption of ASU 2016-01		(4,876)
Net other comprehensive income (loss)		(4,876)
Ending balance		0	4,876
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(20,131)	(528)	(27,009)
Other comprehensive income (loss) before reclassifications		(14,727)	26,481
Net other comprehensive income (loss)	(1,939)
Ending balance	$ (22,070)	$ (20,131)	$ (528)