Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2017

COMMITMENTS AND CONTINGENCIES [Abstract]

Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]

Scheduled minimum rental commitments under non-cancellable operating leases at December 31, 2017, consist of the following (in thousands):

2018	$	15,077
2019	10,732
2020	8,233
2021	5,997
2022	4,974
Thereafter	16,247
Total commitments	$	61,260