Income Taxes - Uncertain Tax Positions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	$ 171,177	$ 110,561	$ 109,712
Increases to tax positions related to the current year	42,877	33,880	28,416
Increases to tax positions related to prior years	8,124	26,219	4,469
Decreases to tax positions related to prior years	2,262	0	0
Reductions due to lapsed statute of limitations	4,688	2,525	23,709
Settlements during current year	0	100	0
Interest and penalties	5,304	3,142	(8,327)
Ending balance	$ 220,532	$ 171,177	$ 110,561