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Commitments and Contingencies - Minimum Lease Requirements (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Minimum lease commitments for property and equipment      
Lease expenses $ 2,300 $ 2,300 $ 2,900
Property and equipment      
Minimum lease commitments for property and equipment      
2016 2,154    
2017 1,677    
2018 1,011    
2019 529    
2020 534    
Thereafter 2,169    
Total $ 8,074