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Long-Term Debt (Details Textual) (USD $)
In Millions, unless otherwise specified
12 Months Ended 12 Months Ended
Dec. 31, 2013
Aug. 09, 2013
Revolving credit facility
Aug. 03, 2012
Revolving credit facility
Aug. 31, 2011
Revolving credit facility
Dec. 31, 2013
Eurocurrency [Member]
Dec. 31, 2013
Base Rate [Member]
Aug. 09, 2013
Term Loan Facility Maturing [Member]
Aug. 03, 2012
Term Loan Facility Maturing [Member]
Aug. 31, 2011
Term Loan Facility Maturing [Member]
Line of Credit Facility [Line Items]                  
Revolving credit facility     $ 125.0 $ 100.0          
Increased revolving credit facility   200.0              
Term loan             175.0 170.0 140.0
Debt Instrument, Maturities, Quarterly Repayments of Principal in Next Twelve Months 2.2                
Debt Instrument,Maturities,Quarterly Repayments of Principal Years Two and Three 3.3                
Debt Instrument, Maturities, Quarterly Repayments of Principal Years Four and Five 4.4                
Debt Instrument, Maturity Date Aug. 09, 2018                
Interest rate applicable margin range, Minimum         2.00% 1.00%      
Interest Rate applicable margin range, Maximum         3.30% 2.30%      
Issuance in letters of credit 30.0                
Outstanding letters of credit 13.9                
Total availability under revolving credit facility $ 164.1                
Average interest rate on credit agreement 2.90%