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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Purchase Obligations      
2017 $ 54,751    
2018 0    
2019 0    
2020 0    
2021 0    
Thereafter 0    
Total long-term obligations 54,751    
Operating Leases      
2017 7,018    
2018 6,235    
2019 5,646    
2020 4,529    
2021 3,760    
Thereafter 6,967    
Total long-term obligations 34,155    
Rent expense $ 5,300 $ 5,000 $ 5,700