Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2017

Future Minimum Operating Lease Payments under Non-Cancelable Leases

Future minimum operating lease payments under non-cancelable leases at December 31, 2017 were as follows (in thousands):

	Operating Leases
2018	$	37,661
2019		31,864
2020		27,288
2021		24,502
2022		20,558
Thereafter		42,768
Less sublease income		(4,674	)
Total minimum lease payments	$	179,967