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Debt Senior Credit Facility (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Dec. 31, 2012
Mar. 31, 2013
Term Loan A
Mar. 31, 2013
Term Loan A2
Mar. 31, 2013
Term Loan A - 3
Mar. 31, 2013
Term Loan B
Mar. 31, 2013
Revolver
Mar. 31, 2013
Term Loan A B A-2 and A-3
Mar. 31, 2013
Letter of Credit
Mar. 31, 2013
Additional Revolver
Apr. 03, 2013
Line of Credit
Subsequent Event
New Term Loan B
BNP Paribas
Apr. 03, 2013
Line of Credit
Subsequent Event
New Revolver
BNP Paribas
Line of Credit Facility [Line Items]                        
Debt instrument basis spread on variable rate     2.75% 2.75%   2.75% 2.75%       2.50% 2.50%
Debt Instrument, Face Amount     $ 150,000,000 $ 150,000,000 $ 100,000,000 $ 200,000,000            
Line of Credit Facility, Maximum Borrowing Capacity                     300,000,000 700,000,000
Debt Instrument, Interest Rate Terms     LIBOR plus 2.75% LIBOR plus 2.75% LIBOR plus 2.75% LIBOR plus 2.75% with a LIBOR floor of 1.00% LIBOR plus 2.75%          
Debt Instrument, Maturity Date     Aug. 04, 2015 Aug. 04, 2015 Aug. 04, 2015 Aug. 04, 2016 Aug. 04, 2015          
Line of Credit Facility, Remaining Borrowing Capacity             500,000,000          
Long-term Debt               556,400,000 61,000,000 439,000,000    
Long-term Line of Credit $ 0 $ 235,000,000                    
Long-term Debt, Weighted Average Interest Rate 3.20%