Leases (Tables)

12 Months Ended

Dec. 31, 2017

Leases [Abstract]

Summary Operating Lease Future Minimum Payments

The minimum lease payments for the noncancelable operating lease agreements are as follows (in thousands):

2018	$	19,343
2019	14,362
2020	12,132
2021	10,661
2022	10,195
Thereafter	25,335