Debt Schedule of Long Term Debt (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Carrying amount on long-term debt $ 4,721,842 $ 4,663,531
Current portion of long-term debt (54,483) (52,095)
Long-term Debt, net of current portion 4,667,359 4,611,436
Revolving Credit Facility    
Debt Instrument [Line Items]    
Carrying amount on long-term debt 823,881 883,428
Fair Value 823,881 883,428
Term Loan Facility    
Debt Instrument [Line Items]    
Carrying amount on long-term debt 248,750 249,375
Fair Value 248,750 249,375
6 3/4% Notes    
Debt Instrument [Line Items]    
Carrying amount on long-term debt 273,760 308,616
Fair Value 274,369 309,634
Stated interest rate (as a percent) 6.75% 6.75%
The 7 3/4% Notes    
Debt Instrument [Line Items]    
Carrying amount on long-term debt 400,000 400,000
Fair Value 425,750 429,000
Stated interest rate (as a percent) 7.75% 7.75%
The 8 3/8% Notes    
Debt Instrument [Line Items]    
Carrying amount on long-term debt 106,038 106,030
Fair Value 109,836 110,500
Stated interest rate (as a percent) 8.375% 8.375%
Senior Subsidiary Notes    
Debt Instrument [Line Items]    
Carrying amount on long-term debt 157,470 172,420
Fair Value 162,194 175,437
Stated interest rate (as a percent) 6.125% 6.125%
GBP Senior Notes 6.125 Percent, Due 2022    
Debt Instrument [Line Items]    
Carrying amount on long-term debt 592,160 622,960
Fair Value 620,998 639,282
Stated interest rate (as a percent) 6.125%  
6% Notes    
Debt Instrument [Line Items]    
Carrying amount on long-term debt 600,000 600,000
Fair Value 631,500 625,500
Stated interest rate (as a percent) 6.00% 6.00%
The 5 3/4% Notes    
Debt Instrument [Line Items]    
Carrying amount on long-term debt 1,000,000 1,000,000
Fair Value 1,005,000 1,005,000
Stated interest rate (as a percent) 5.75% 5.75%
Accounts Receivable Securitization Program    
Debt Instrument [Line Items]    
Carrying amount on long-term debt 220,800 0
Fair Value 220,800 0
Real Estate Mortgages, Capital Leases and Other    
Debt Instrument [Line Items]    
Carrying amount on long-term debt 298,983 320,702
Fair Value $ 298,983 $ 320,702