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Operating Leases (Tables)
12 Months Ended
Dec. 31, 2014
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:
2015
$
36,797

2016
49,049

2017
34,290

2018
30,862

2019
27,880

Thereafter
78,895

Total
$
257,773