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Property and Equipment - Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2017
USD ($)
disposal
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Property, Plant and Equipment [Line Items]        
Net book value $ 59,464 $ 59,464   $ 68,127
Proceeds from sale of property and equipment   5,830 $ 2,187  
Loss on disposal of property, plant, and equipment   $ 204 $ (255)  
TEXAS | Office Equipment And Land        
Property, Plant and Equipment [Line Items]        
Number of assets disposed of | disposal   1    
Net book value 4,100 $ 4,100    
Proceeds from sale of property and equipment $ 3,000      
Loss on disposal of property, plant, and equipment   $ 1,100