Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Schedule of Operating Leases Payments

At December 31, 2017, the future minimum lease payments required under the non-cancellable operating leases were as follows (in thousands):

Year	Minimum Lease Payments
2018	$	21,084
2019	16,336
2020	11,652
2021	8,148
2022	5,245
Thereafter	7,818
Total	$	70,283