Accumulated Other Comprehensive Income (Loss) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2016 USD ($)
Accumulated Other Comprehensive Income (Loss), Net [Rollforward]
Beginning balance	$ 1,979,794
Other comprehensive income (loss) before reclassifications	(894)
Ending Balance	2,015,640
Foreign currency
Accumulated Other Comprehensive Income (Loss), Net [Rollforward]
Beginning balance	(21,791)
Other comprehensive income (loss) before reclassifications	2,510
Ending Balance	(19,281)
Unrealized gain (loss) in Accumulated OCI
Accumulated Other Comprehensive Income (Loss), Net [Rollforward]
Beginning balance	(746)
Other comprehensive income (loss) before reclassifications	(3,404)
Ending Balance	(4,150)
AOCI
Accumulated Other Comprehensive Income (Loss), Net [Rollforward]
Beginning balance	(22,537)
Ending Balance	$ (23,431)