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Long-Term Debt (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2013
Jun. 30, 2015
Jan. 31, 2013
Senior Credit Agreement      
Debt Instrument [Line Items]      
Maximum borrowing capacity under the revolving credit facility   $ 200,000,000  
Revolving credit facility, increase, additional borrowings   250,000,000  
Standby letters of credit   $ 20,584,000  
Fixed charge coverage ratio   125.00%  
Senior Subordinated 8% Notes, Due December 1, 2015      
Debt Instrument [Line Items]      
Debt instrument, issued value $ 204,000,000    
Senior Subordinated Notes, interest rate 8.00%    
Loss on extinguishment of debt $ 7,166,000    
Prepayment premium for extinguishment of debt 3,702,000    
Write-off deferred financing fees 2,199,000    
Write off of debt discount $ 1,265,000    
Revolving credit facility      
Debt Instrument [Line Items]      
Revolving credit facility, annual commitment fee   0.375%  
Revolving credit facility, availability amount   $ 82,466,000  
Senior Subordinated 6.25% Notes      
Debt Instrument [Line Items]      
Debt instrument, issued value     $ 210,000,000
Senior Subordinated Notes, interest rate 6.25% 6.25%  
Placement and other fees $ 3,755,000    
London Interbank Offering Rate (LIBOR) | Minimum | Revolving credit facility      
Debt Instrument [Line Items]      
LIBOR floor, plus   2.00%  
London Interbank Offering Rate (LIBOR) | Maximum | Revolving credit facility      
Debt Instrument [Line Items]      
LIBOR floor, plus   2.50%