Commitments

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Commitments

COMMITMENTS

Certain of the Company’s subsidiaries lease facilities and equipment used in operations under both month-to-month and fixed-term agreements. The aggregate minimum rentals under operating leases with non-cancelable terms of one year or more as of December 31, 2017 are as follows:

	Lease Commitments
Year Ending December 31:
2018	$	31,436
2019	31,774
2020	26,664
2021	24,783
2022	21,594
Thereafter	118,216
Total	$	254,467

The Company’s rental expense for the years ended December 31, 2017, 2016 and 2015 was $34,858, $27,237 and $24,446, respectively.