Income Taxes - Schedule of Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current:
Federal	$ 316,031	$ 239,217	$ 229,224
State	29,768	21,779	22,041
Foreign	89,894	54,937	71,507
Deferred:
Federal	(358,300)	(26,760)	6,710
State	(3,670)	189	(16,844)
Foreign	(10,772)	(7,355)	(6,360)
Total	$ 62,951	$ 282,007	$ 306,278