Debt (Details) (USD $) In Thousands, unless otherwise specified										3 Months Ended		6 Months Ended																						6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 Revolving Credit Facility and Term Loan Facility	Jun. 30, 2013 Revolving Credit Facility	Dec. 31, 2012 Revolving Credit Facility	Jun. 30, 2013 Term Loan Facility	Dec. 31, 2012 Term Loan Facility	Jun. 30, 2013 Credit Agreement	Dec. 31, 2012 Credit Agreement	Jun. 30, 2013 Revolving Credit Facility and Outstanding Letters of Credit	Jun. 30, 2012 Revolving Credit Facility and Outstanding Letters of Credit	Jun. 30, 2013 Revolving Credit Facility and Outstanding Letters of Credit	Jun. 30, 2012 Revolving Credit Facility and Outstanding Letters of Credit	Jun. 30, 2013 The 7 1/4% Notes	Dec. 31, 2012 The 7 1/4% Notes	Jun. 30, 2013 The Subsidiary Notes	Dec. 31, 2012 The Subsidiary Notes	Jun. 30, 2013 The 8% Notes due 2018	Dec. 31, 2012 The 8% Notes due 2018	Jun. 30, 2013 The 6 3/4% Notes	Dec. 31, 2012 The 6 3/4% Notes	Jun. 30, 2013 The 7 3/4% Notes due 2019	Dec. 31, 2012 The 7 3/4% Notes due 2019	Jun. 30, 2013 The 8% Notes due 2020	Dec. 31, 2012 The 8% Notes due 2020	Jun. 30, 2013 The 8 3/8% Notes	Dec. 31, 2012 The 8 3/8% Notes	Jun. 30, 2013 The 5 3/4% notes due 2024	Dec. 31, 2012 The 5 3/4% notes due 2024	Jun. 30, 2013 Real Estate Mortgages, Capital Leases and Other	Dec. 31, 2012 Real Estate Mortgages, Capital Leases and Other	Jun. 30, 2013 New Credit Agreement	Jun. 27, 2011 New Credit Agreement	Jun. 30, 2013 New Credit Agreement Minimum	Jun. 30, 2013 New Credit Agreement Maximum	Jun. 30, 2013 New Revolving Credit Facility	Jun. 27, 2011 New Revolving Credit Facility item	Jun. 30, 2013 New Revolving Credit Facility Minimum	Jun. 30, 2013 New Revolving Credit Facility Maximum	Jun. 27, 2011 New Revolving Credit Facility, Tranche One	Jun. 27, 2011 New Revolving Credit Facility, Tranche Two	Jun. 27, 2011 New Revolving Credit Facility, Tranche Three	Jun. 30, 2013 New Term Loan Facility	Jun. 27, 2011 New Term Loan Facility
Long-term Debt Information
Carrying Amount	$ 3,938,700	$ 3,825,003		$ 187,700	$ 55,500	$ 450,000	$ 462,500							$ 228,180	$ 242,813	$ 166,338	$ 175,875	$ 49,848	$ 49,834	$ 330,338	$ 335,152	$ 400,000	$ 400,000	$ 300,000	$ 300,000	$ 548,604	$ 548,518	$ 1,000,000	$ 1,000,000	$ 277,692	$ 254,811
Less Current Portion	(324,682)	(92,887)
Long-term Debt, Net of Current Portion	3,614,018	3,732,116
Fair Value				187,700	55,500	450,000	462,500							228,408	242,813	169,664	181,591	52,905	56,052	335,902	341,753	430,500	451,000	311,475	317,250	583,000	610,500	930,000	1,012,500	277,692	254,811
Stated Interest Rate (as a percent)														7.25%	7.25%	7.50%	7.50%	8.00%	8.00%	6.75%	6.75%	7.75%	7.75%	8.00%	8.00%	8.375%	8.375%	5.75%	5.75%
Capital Stock of First Tier Foreign Subsidiaries Pledged to Secure Debt (as a percent)			66.00%
Ownership in U.S. Subsidiaries that are Considered Guarantor of Parent Notes (as a percent)	100.00%
Maximum Borrowing Capacity																																					725,000			400,000	150,000	175,000		500,000
Optional expanded maximum borrowing capacity																																	1,800,000
Number of Banks Supporting the Credit Facility																																					19
Outstanding borrowings under credit facility																																				187,700
Letters of Credit Outstanding																																2,312
Remaining availability under credit facility																																				534,988
Effective interest rate (as a percent)																																				2.50%		2.00%	4.00%				2.00%
Commitment fees and letters of credit fees										$ 546	$ 449	$ 1,156	$ 1,049
Repayments Of Loan
Loan payment as a percentage of principal in first three quarterly installments of year five																																												10.00%
Loan payment as a percentage of principal in final quarterly installment of year five																																												35.00%
June 30, 2012 (as a percent)																																												5.00%
June 30, 2013 (as a percent)																																												5.00%
June 30, 2014 (as a percent)																																												10.00%
June 30, 2015 (as a percent)																																												15.00%
June 27, 2016 (as a percent)																																												65.00%
Debt covenants
Revolving Credit and Term Leverage Ratio								4.06	3.93
Revolving Credit and Term Leverage Ratio, Maximum Allowable								5.50	5.50
Bond Leverage Ratio, per Indentures								4.92	5.33
Bond Leverage Ratio, per Indentures, Maximum Allowable								6.50	6.50
Revolving Credit and Term Loan Fixed Charge Coverage Ratio								1.37	1.33
Revolving Credit and Term Loan Fixed Charge Coverage Ratio, Minimum Allowable								1.00	1.20
Commitment fee (as a percent)																																		0.30%	0.50%