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Fair Value Measurements - Financial Instruments Carried and Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities, restricted, long-term $ 336 $ 336
Recurring Basis    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities, restricted, long-term 336 336
Total assets at fair value 336 336
Stock appreciation rights, liability-classified equity award 536  
Total liabilities at fair value 536  
Recurring Basis | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities, restricted, long-term 0 0
Total assets at fair value 0 0
Stock appreciation rights, liability-classified equity award 0  
Total liabilities at fair value 0  
Recurring Basis | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities, restricted, long-term 336 336
Total assets at fair value 336 336
Stock appreciation rights, liability-classified equity award 536  
Total liabilities at fair value 536  
Recurring Basis | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment securities, restricted, long-term 0 0
Total assets at fair value 0 $ 0
Stock appreciation rights, liability-classified equity award 0  
Total liabilities at fair value $ 0