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Lease Commitments (Tables)
12 Months Ended
Dec. 31, 2017
Leases [Abstract]  
Future Minimum Rental Commitments
The approximate future minimum rental commitments, exclusive of taxes and other related charges, for all significant non-cancellable operating leases at December 31, 2017, are summarized as follows (in thousands):
Year ending December 31,
 
2018
$
8,032

2019
7,511

2020
6,980

2021
4,854

2022
3,378

Thereafter
14,578

 
$
45,333