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Leases (Tables)
12 Months Ended
Dec. 31, 2016
Leases [Abstract]  
Future Minimum Rental Payments for Operating Leases [Table Text Block]
As of December 31, 2016, our minimum lease payment requirements for noncancelable operating leases with remaining terms of more than one year are as follows (in thousands):

2017
 
$
15,132

2018
 
14,697

2019
 
14,078

2020
 
13,850

2021
 
12,881

Thereafter
 
67,602

Total
 
$
138,240