Commitments and Contingent Liabilities (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Aggregate future minimum lease payments for operating and capital leases [Table Text Block]

The aggregate future minimum lease payments for operating and capital leases as of December 31, 2017 are as follows:

	Operating		Capital
2018	$	72,220	$	3,454
2019	53,878		2,951
2020	38,691		1,448
2021	26,947		1,212
2022	21,793		1,150
Thereafter	57,185		5,062
Total	$	270,714	$	15,277