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Long-Term Debt (Details 2) (USD $)
12 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Jul. 31, 2011
Revolving credit facility due July 2016
Mar. 31, 2012
Revolving credit facility due July 2016
Sep. 30, 2011
Revolving credit facility due July 2016
Dec. 31, 2013
Revolving credit facility due July 2016
Dec. 31, 2013
Revolving credit facility due July 2016
LIBOR
Dec. 31, 2013
Revolving credit facility due July 2016
LIBOR
Low end of range
Dec. 31, 2013
Revolving credit facility due July 2016
LIBOR
High end of range
Dec. 31, 2013
Revolving credit facility due July 2016
Base rate loans
Dec. 31, 2013
Revolving credit facility due July 2016
Base rate loans
Low end of range
Dec. 31, 2013
Revolving credit facility due July 2016
Base rate loans
High end of range
Dec. 31, 2013
Revolving credit facility due July 2016
Federal Funds
Dec. 31, 2013
Revolving credit facility due July 2016
one-month LIBOR
Long-Term Debt                              
Expiration period of credit facility       5 years                      
Revolving credit facility borrowing capacity       $ 1,100,000,000 $ 900,000,000                    
Transaction costs 12,147,000 1,011,000 8,823,000 7,800,000                      
Write-off of deferred financing costs         1,300,000 1,600,000                  
Borrowings       387,300,000                      
Debt instrument, variable rate basis               LIBOR     base rate     Federal Funds Rate one-month LIBOR
Debt instrument, basis spread on variable rate (as a percent)               1.50% 1.50% 2.50%   0.50% 1.50% 0.50% 1.00%
Weighted average annual interest rate (as a percent)             1.70%                
Outstanding borrowings             49,000,000                
Outstanding letters of credit             106,100,000                
Undrawn capacity under revolving credit facility             744,900,000                
Available borrowings under revolving credit facility             744,900,000                
Percentage of equity interests in first tier foreign subsidiaries             65.00%                
Maximum additional commitment amount             $ 300,000,000                
Minimum adjusted EBITDA to total interest expense ratio             2.25                
Maximum consolidated total debt to adjusted EBITDA ratio             5.0                
Maximum senior secured debt to EBITDA ratio             4.0