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Leases (Tables)
 12 Months Ended
Dec. 31, 2017
Schedule of Future Minimum Rental Payments [Abstract]  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
As of December 31, 2017, 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
2018
 
$
9,865

 
$
(6,741
)
 
$
3,124

2019
 
9,783

 
(6,930
)
 
2,853

2020
 
9,808

 
(7,126
)
 
2,682

2021
 
9,832

 
(7,327
)
 
2,505

2022
 
4,157

 
(3,117
)
 
1,040

Thereafter
 
—

 
—

 
—

Total
 
$
43,445

 
$
(31,241
)
 
$
12,204