Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Schedule of future minimum lease payments for capital and operating leases

Future minimum lease payments under non-cancelable capital and operating leases (with initial or remaining lease terms in excess of one year) as of December 31 are as follows:

	Capital		Operating	Total Future Payments
2018	$	1,433	115,736	117,169
2019	1,094		91,226	92,320
2020	769		70,146	70,915
2021	597		47,356	47,953
2022	590		26,927	27,517
Thereafter	3,954		39,615	43,569
Total payments	8,437		391,006	399,443
Less amount representing interest	1,510
Present value of capitalized lease payments	$	6,927