Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Restricted cash	$ 5,352	$ 13,499
Prepaid vehicle licenses	47,806	47,561
Prepaid operating taxes	18,510	15,208
Prepaid sales commission	11,446	12,255
Other	55,029	44,158
Total	$ 138,143	$ 132,681