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Operating Leases Operating Leases (Tables)
 12 Months Ended
Dec. 31, 2014
Leases [Abstract]  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
Future minimum lease payments related to the operating leases described above, as of December 31, 2014, are as follows:
 
Amounts (in thousands)
 
Related Party
Non-Related Party
Total
2015
$
6,580

$
507

$
7,087

2016
5,010

206

5,216

2017
3,718

135

3,853

2018
3,408

—

3,408

Thereafter
—

—

—

Total
$
18,716

$
848

$
19,564