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Long-Term Debt - Additional Information (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Nov. 15, 2013
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
2013 Term Loan Facility [Member]        
Debt And Credit Facility [Line Items]        
Principal payment on Term Loan Facility     $ 18,273,000  
Line of Credit [Member] | 2013 Senior Credit Facility [Member]        
Debt And Credit Facility [Line Items]        
Line of credit facility, maximum borrowing capacity $ 370,000,000      
Maximum percentage available on line of credit due to exceeded maximum leverage ratio 25.00%      
Threshold from sale of assets used towards mandatory prepayments $ 30,000,000      
Net sales proceeds from legal sale of property, accounted for as building financing arrangement   $ 43,500,000    
Secured Debt [Member] | 2013 Senior Credit Facility [Member]        
Debt And Credit Facility [Line Items]        
Debt issuance costs 5,119,000      
Debt discount related to creditor fees 4,356,000      
Secured Debt [Member] | 2013 Term Loan Facility [Member]        
Debt And Credit Facility [Line Items]        
2013 Term Loan Facility outstanding principal balance 325,000,000 306,727,000 306,727,000 $ 308,284,000
Proceeds from 2013 Term Loan Facility $ 323,375,000      
Original issue discount, percentage 0.50%      
Original issue discount $ 1,625,000 7,768,000 $ 7,768,000 8,413,000
Percent of amendment fee paid to consenting lenders     0.25%  
Mandatory prepayment from sale of assets 13,500,000      
Loss on extinguishment of debt       493,000
Write off of deferred debt issuance cost       119,000
Write-off of unamortized original issue discount       $ 374,000
Term after which excess cash flow is paid (in days)       95 days
Long term debt, gross less unamortized discount   298,959,000 $ 298,959,000  
Unamortized debt issuance costs   $ 3,307,000 $ 3,307,000  
Revolving Credit Facility [Member] | 2013 Revolving Loan Facility [Member]        
Debt And Credit Facility [Line Items]        
Line of credit facility, maximum borrowing capacity 45,000,000      
Maximum leverage ratio   4.50 4.50  
Unutilized portion of the 2013 Revolving Loan Facility   $ 42,150,000 $ 42,150,000  
Available portion currently available revolving facility   11,250,000 11,250,000  
Letter of Credit [Member] | 2013 Senior Credit Facility [Member]        
Debt And Credit Facility [Line Items]        
Line of credit facility, maximum borrowing capacity $ 5,500,000      
Letter of Credit [Member] | 2013 Revolving Loan Facility [Member]        
Debt And Credit Facility [Line Items]        
Letters of credit outstanding   2,850,000 2,850,000  
Fair Value, Inputs, Level 2 [Member] | Secured Debt [Member] | 2013 Term Loan Facility [Member]        
Debt And Credit Facility [Line Items]        
Fair market value of debt   $ 242,314,000 $ 242,314,000 $ 221,964,000
Base Rate [Member] | Line of Credit [Member] | 2013 Senior Credit Facility [Member]        
Debt And Credit Facility [Line Items]        
Basis spread on variable rate 2.50%      
Base Rate [Member] | Secured Debt [Member] | 2013 Term Loan Facility [Member]        
Debt And Credit Facility [Line Items]        
Variable rate floor 2.00%      
London Interbank Offered Rate (LIBOR) [Member] | Line of Credit [Member] | 2013 Senior Credit Facility [Member]        
Debt And Credit Facility [Line Items]        
Basis spread on variable rate 3.50%      
London Interbank Offered Rate (LIBOR) [Member] | Secured Debt [Member] | 2013 Term Loan Facility [Member]        
Debt And Credit Facility [Line Items]        
Variable rate floor 1.00%      
Leverage Ratio, Greater Than 2.50 [Member] | Line of Credit [Member] | 2013 Senior Credit Facility [Member]        
Debt And Credit Facility [Line Items]        
Maximum leverage ratio       2.5
Excess cash flow repayment, percentage       50.00%
Leverage Ratio, Greater than 2.00 but Less than 2.50 [Member] | Line of Credit [Member] | 2013 Senior Credit Facility [Member]        
Debt And Credit Facility [Line Items]        
Maximum leverage ratio       2
Excess cash flow repayment, percentage       25.00%
Leverage Ratio, Less Than or Equal to 2.00 [Member] | Line of Credit [Member] | 2013 Senior Credit Facility [Member]        
Debt And Credit Facility [Line Items]        
Excess cash flow repayment, percentage       0.00%