Lease Commitments (Tables)

12 Months Ended

Dec. 31, 2017

Leases [Abstract]

Future Minimum Payments for All Non-Cancelable Operating Leases

Future minimum payments for all non-cancelable operating leases are as follows:

Year	Minimum Future Operating Lease Commitments
2018	$	30,301
2019	28,690
2020	20,965
2021	14,723
2022	11,858
Thereafter	33,113