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Leases (Tables)
 12 Months Ended
Dec. 31, 2014
Leases [Abstract]  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
As of December 31, 2014, the future minimum rental commitments (in thousands) for all non-cancelable operating leases with initial or remaining terms of more than one year (both gross and net of any sublease income) are as follows:
 
 
 
Gross
 
Sublease
Income
 
Net
2015
 
$
9,023

 
$
(5,659
)
 
$
3,364

2016
 
7,607

 
(5,835
)
 
1,772

2017
 
8,085

 
(6,007
)
 
2,078

2018
 
9,224

 
(5,963
)
 
3,261

2019
 
9,311

 
(5,966
)
 
3,345

Thereafter
 
23,165

 
(15,142
)
 
8,023

Total
 
$
66,415

 
$
(44,572
)
 
$
21,843