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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2016
Commitments and Contingencies [Abstract]  
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]
The following is an estimate of our future minimum lease payments for operating leases having remaining noncancelable terms in excess of one year as of December 31, 2016 (in thousands):

2017
 
$
4,943

2018
 
2,189

2019
 
253

2020
 
190

2021
 

Thereafter
 
60

Total future minimum rentals
 
$
7,635