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Operating Leases (Tables)
12 Months Ended
Dec. 31, 2018
Operating Leases [Abstract]  
Schedule of Future Minimum Lease Payments for Capital Leases [Table Text Block]
Future minimum annual lease payments under noncancelable operating leases consist of the following at December 31:
2019
$
44,551

2020
42,495

2021
36,740

2022
30,054

2023
22,793

Thereafter
53,338

Total
$
229,971