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Leases (Tables)
12 Months Ended
Dec. 31, 2014
Leases [Abstract]  
Future Minimum Rental Payments for Operating Leases [Table Text Block]
As of December 31, 2014, our minimum lease payment requirements for noncancelable operating leases with remaining terms of more than one year are as follows (in thousands):
2015
 
$
13,042

2016
 
9,909

2017
 
9,583

2018
 
9,142

2019
 
8,819

Thereafter
 
32,854

Total
 
$
83,349