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Commitments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Commitments and Contingencies Disclosure [Abstract]      
Total net rent expense $ 9,000 $ 12,200 $ 14,000
Net Operating Leases      
2017 9,265    
2018 5,660    
2019 2,805    
2020 1,539    
2021 1,135    
Thereafter 808    
Total minimum payments 21,212    
Other Contractual Obligations      
2017 1,049    
2018 766    
2019    
2020 0    
2021 0    
Thereafter 0    
Total minimum payments $ 1,815