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Lease Commitments
12 Months Ended
Dec. 31, 2017
Leases [Abstract]  
Lease Commitments
Lease 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


Rental expense was $8.8 million, $8.7 million and $8.9 million for the years ended December 31, 2017, 2016 and 2015, respectively.