Prepaid Expenses and Other Current Assets (Tables)

12 Months Ended

Dec. 31, 2017

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

Prepaid expenses and other current assets

	December 31,
	2017		2016
	(In thousands)
Restricted cash	$	4,674	3,838
Prepaid vehicle licenses	62,772		50,343
Prepaid operating taxes	14,320		20,242
Prepaid sales commission	12,988		9,731
Prepaid insurance	15,688		12,074
Start-up costs	8,001		5,284
Other	41,040		39,768
Total	$	159,483	141,280