Property and Equipment - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property, software and equipment depreciation, amortization expense	$ 272,500	$ 215,300	$ 162,900
Capitalization of stock-based compensation	17,867	15,226	$ 12,325
Impairment of long-lived assets held-for-use	$ 48,700	$ 100,100