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Debt Senior Credit Facility (Details) (USD $)
6 Months Ended
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2013
Term Loan A
Jun. 30, 2013
Term Loan A2
Jun. 30, 2013
Term Loan B
Apr. 03, 2013
Term Loan B
Jun. 30, 2013
Revolver
Apr. 03, 2013
Revolver
Jun. 30, 2013
Letter of Credit
Jun. 30, 2013
Additional Revolver
Apr. 03, 2013
London Interbank Offered Rate (LIBOR) [Member]
Term Loan B
Line of Credit Facility [Line Items]                      
Face amount           $ 300,000,000          
Basis spread on variable rate     2.75% 2.75% 2.75%   2.75%       2.50%
Floor interest rate                     0.75%
Current borrowing capacity               700,000,000      
Debt Issuance Cost 10,200,000                    
Payments of Debt Extinguishment Costs 1,100,000                    
Payments of Financing Costs 9,100,000                    
Write off unamortized debt discount 1,100,000                    
Write off of Deferred Debt Issuance Cost 3,300,000                    
Line of Credit Facility, Remaining Borrowing Capacity 295,000,000                    
Long-term Debt         300,000,000       58,200,000 346,800,000  
Revolver $ 295,000,000 $ 235,000,000                  
Long-term Debt, Weighted Average Interest Rate 3.00%                    
Total Leverage Ratio 5.75                    
Senior Secured Leverage Ratio 3.50                    
Interest Coverage Ratio 3.00