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Operating Leases (Tables)
12 Months Ended
Dec. 31, 2012
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:

2013
$
27,423

2014
26,760

2015
25,424

2016
24,172

2017
21,435

Thereafter
63,561

Total
$
188,775