Income Taxes - Schedule of Reconciliation of the Beginning and Ending Amount of Reserve for Uncertain Tax Positions(Excluding Interest and Penalties) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of reserve for uncertain tax positions, Excluding Amounts Pertaining to Examined Tax Returns
Beginning Balance	$ 301,558	$ 252,434	$ 259,301
Additions based on tax positions related to current year	8,459	50,469	23,978
Additions for tax positions of prior years	14,396	8,978	20,336
Reductions for tax positions of prior years	(9,134)	(10,323)	(51,181)
Ending Balance	$ 315,279	$ 301,558	$ 252,434