Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Restricted cash	$ 3,838	$ 5,352
Prepaid vehicle licenses	50,343	47,806
Prepaid operating taxes	20,242	18,510
Prepaid sales commission	9,731	11,446
Prepaid Insurance	12,074	9,057
Other	45,052	45,972
Total	$ 141,280	$ 138,143