Lease Commitments (Tables)

12 Months Ended

Dec. 31, 2017

Leases, Operating [Abstract]

Future Minimum Lease Payments under Operating Leases

The following is a schedule by calendar year of future minimum lease payments under operating leases that have remaining terms as of December 31, 2017:

Period/Year	Operating Leases
	(in thousands)
2018	$	2,482
2019	1,968
2020	1,489
2021	734
2022	735
Thereafter	1,710
Total minimum lease payments	$	9,118

Operating Leases Expense

Total expense for all operating leases for the years ended December 31, 2017, 2016 and 2015 was as follows:

	Year Ended December 31,
	2017		2016		2015
	(in thousands)
Operating lease expense	$	3,833	$	2,615	$	2,003