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Fair Value Measurements - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Mar. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Time deposits, $250,000 or more $ 250 $ 250      
Note receivable         $ 1,000
Interest rate         8.00%
Asset impairment charges   520 $ 2,087 $ 355  
Property and equipment 735 735 2,040    
Proceeds from sale of property and equipment   52 942 $ 26  
Cost of Sales | Nonrecurring Basis          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Impairment charges   800      
Other Nonoperating Income (Expense) [Member] | Highview Enterprises Limited | Cost method investment          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Asset impairment charges $ 1,800        
Disposed of by Sale          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Impairment charges   $ 500      
Proceeds from sale of impaired assets     600    
Property and equipment     100    
Proceeds from sale of property and equipment     300    
Gain on disposition of assets     200    
Disposed of by Sale | General and Administrative Expense          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Impairment charges     $ 300