Contingencies (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Schedule of Minimum Rental Payments for Operating Leases

Future minimum lease payments as of December 31, 2017 under the leases are as follows:

(in thousands)	Minimum lease payments
2018	$	1,007
2019	$	743
2020	$	394
2021	$	302
2022	$	205
Thereafter	$	—