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Long-Term Obligations - GMSL Credit Facility (Details) - USD ($)
1 Months Ended 12 Months Ended
Jan. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Line of Credit Facility [Line Items]      
Outstanding debt   $ 381,614,000  
GMSL | Note Payable Collateralized by Assets      
Line of Credit Facility [Line Items]      
Basis spread on variable rate (as a percent) 3.65% 3.65%  
GMSL | Term Loan      
Line of Credit Facility [Line Items]      
Term loan amount established $ 20,000,000    
Outstanding debt   $ 5,260,000 $ 16,732,000
GMSL | Term Loan | LIBOR      
Line of Credit Facility [Line Items]      
Debt instrument term 4 years 6 months