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Operating Leases
12 Months Ended
Dec. 31, 2017
Leases, Operating [Abstract]  
Operating Leases
Operating Leases
Lessee. The Company leases certain equipment, offices and warehouse space under non-cancelable operating leases. Rental expense was $11.4 million, $11.3 million and $11.8 million for 2017, 2016 and 2015, respectively.
A summary of future rental commitments over the next five years under non-cancelable operating leases follows (in thousands):
Years Ending December 31,
 
2018
$
10,334

2019
9,812

2020
9,480

2021
9,435

2022
9,251

Total
$
48,312