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Long-Term Debt and Senior Subordinated Credit Facility - Incremental Term Loan - Additional Information (Details) - USD ($)
1 Months Ended 12 Months Ended
Oct. 11, 2013
Jun. 03, 2013
Jun. 01, 2013
Jun. 30, 2015
Dec. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Jun. 19, 2015
Dec. 02, 2013
Dec. 31, 2009
Debt Instrument [Line Items]                      
Loss on extinguishment of debt   $ 17,069,000           $ 26,018,000      
Accretion of discount on long-term debt           $ 481,000 $ 447,000 $ 1,013,000      
New Revolving Credit Facility                      
Debt Instrument [Line Items]                      
Credit facility borrowing capacity                     $ 120,000,000
Credit facility, available borrowings           25,700,000          
Revolving credit facility           19,500,000 $ 2,000,000        
New Revolving Credit Facility | Base Rate                      
Debt Instrument [Line Items]                      
Basis spread on variable rate     5.25%                
Letter of Credit                      
Debt Instrument [Line Items]                      
Revolving credit facility           4,800,000          
Term Loan Facility | Base Rate                      
Debt Instrument [Line Items]                      
Basis spread on variable rate     4.25%                
First Amendment to New Credit Agreement | Committed Incremental Term Loan                      
Debt Instrument [Line Items]                      
Credit facility borrowing capacity $ 70,000,000                 $ 70,000,000  
Principal amount funded (percent) 99.00%                    
Debt instrument, periodic payment         $ 1,225,000            
Second Amendment to New Credit Agreement | New Revolving Credit Facility                      
Debt Instrument [Line Items]                      
Credit facility borrowing capacity                 $ 50,000,000    
Second Amendment to New Credit Agreement | Committed Incremental Term Loan                      
Debt Instrument [Line Items]                      
Credit facility borrowing capacity                 $ 30,000,000    
Debt instrument, periodic payment       $ 1,300,000              
New Credit Agreement | LIBOR                      
Debt Instrument [Line Items]                      
Basis spread on variable rate   1.00%                  
New Credit Agreement | New Revolving Credit Facility                      
Debt Instrument [Line Items]                      
Credit facility borrowing capacity   $ 50,000,000                  
New Credit Agreement | Letter of Credit                      
Debt Instrument [Line Items]                      
Credit facility borrowing capacity   $ 20,000,000                  
New Credit Agreement | Committed Incremental Term Loan                      
Debt Instrument [Line Items]                      
Credit facility borrowing capacity $ 70,000         70,000       $ 70,000  
Debt instrument, periodic payment           1,050,000          
Percentage of ownership from investees (percent) 50.00%                    
Loss on extinguishment of debt           3,817,000          
Unamortized deferred costs and associated discount           1,721,000          
Accretion of discount on long-term debt           $ 2,025,000          
New Credit Agreement | Committed Incremental Term Loan | Base Rate                      
Debt Instrument [Line Items]                      
Basis spread on variable rate 2.25%                    
New Credit Agreement | Committed Incremental Term Loan | LIBOR                      
Debt Instrument [Line Items]                      
Basis spread on variable rate 3.25%                    
LIBOR floor 1.00%                    
New Credit Agreement | Term Loan Facility                      
Debt Instrument [Line Items]                      
Actual ratio of consolidated total debt to Consolidated Adjusted EBITDA           4.10%          
New Credit Agreement | Term Loan Facility | Base Rate                      
Debt Instrument [Line Items]                      
Basis spread on variable rate   2.25%                  
New Credit Agreement | Term Loan Facility | LIBOR                      
Debt Instrument [Line Items]                      
Basis spread on variable rate   3.25%