Debt (Details) (USD $) In Thousands, unless otherwise specified															6 Months Ended							3 Months Ended		6 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jun. 30, 2012 Parent	Dec. 31, 2011 Parent	Jun. 30, 2012 Canada Company	Dec. 31, 2011 Canada Company	Jun. 30, 2012 Revolving Credit Facility	Dec. 31, 2011 Revolving Credit Facility	Jun. 30, 2012 Term Loan Facility	Dec. 31, 2011 Term Loan Facility	Jun. 27, 2011 Term Loan Facility	Jun. 30, 2012 Credit Agreement	Dec. 31, 2011 Credit Agreement	Jun. 27, 2011 Credit Agreement	Jun. 30, 2012 Credit Agreement Maximum	Jun. 30, 2012 Credit Agreement Minimum	Jun. 30, 2012 Revolving Credit Facility	Jun. 27, 2011 Revolving Credit Facility bank	Jun. 27, 2011 Revolving Credit Facility, Tranche One	Jun. 27, 2011 Revolving Credit Facility, Tranche Two	Jun. 27, 2011 Revolving Credit Facility, Tranche Three	Jun. 30, 2012 Revolving Credit Facility and Outstanding Letters of Credit	Jun. 30, 2011 Revolving Credit Facility and Outstanding Letters of Credit	Jun. 30, 2012 Revolving Credit Facility and Outstanding Letters of Credit	Jun. 30, 2011 Revolving Credit Facility and Outstanding Letters of Credit	Jun. 30, 2012 The 7 1/4% Notes	Dec. 31, 2011 The 7 1/4% Notes	Jun. 30, 2012 The 6 5/8% Notes	Dec. 31, 2011 The 6 5/8% Notes	Jun. 30, 2012 The Subsidiary Notes	Dec. 31, 2011 The Subsidiary Notes	Jun. 30, 2012 The 8 3/4% Notes	Dec. 31, 2011 The 8 3/4% Notes	Jun. 30, 2012 The 8% Notes due 2018	Dec. 31, 2011 The 8% Notes due 2018	Jun. 30, 2012 The 6 3/4% Notes	Dec. 31, 2011 The 6 3/4% Notes	Jun. 30, 2012 The 7 3/4% Notes due 2019	Dec. 31, 2011 The 7 3/4% Notes due 2019	Jun. 30, 2012 The 8% Notes due 2020	Dec. 31, 2011 The 8% Notes due 2020	Jun. 30, 2012 The 8 3/8% Notes	Dec. 31, 2011 The 8 3/8% Notes	Jun. 30, 2012 Real Estate Mortgages, Capital Leases and Other	Dec. 31, 2011 Real Estate Mortgages, Capital Leases and Other
Long-term Debt Information
Total Long-Term Debt	$ 3,492,994	$ 3,353,588					$ 268,000	$ 96,000	$ 475,000	$ 487,500																$ 235,575	$ 233,115	$ 318,271	$ 318,025	$ 172,148	$ 171,273	$ 200,000	$ 200,000	$ 49,820	$ 49,806	$ 321,276	$ 328,750	$ 400,000	$ 400,000	$ 300,000	$ 300,000	$ 548,432	$ 548,346	$ 204,472	$ 220,773
Less Current Portion	(62,837)	(73,320)	(682)	(658)	(2,747)	(2,658)
Long-term Debt, net of current portion	3,430,157	3,280,268	2,373,372	2,378,040	187,288	185,953
Fair Value							268,000	96,000	475,000	487,500																235,575	233,115	320,320	320,400	176,236	174,698	206,370	209,000	47,498	47,607	321,020	312,352	432,200	422,750	317,063	313,313	595,375	586,438	204,472	220,773
Stated Interest Rate (as a percent)																										7.25%	7.25%	6.625%	6.625%	7.50%	7.50%	8.75%	8.75%	8.00%	8.00%	6.75%	6.75%	7.75%	7.75%	8.00%	8.00%	8.375%	8.375%
Capital Stock of First Tier Foreign Subsidiaries Pledged to Secure Debt (as a percent)	66.00%
Maximum Borrowing Capacity											500,000							725,000	400,000	150,000	175,000
Optional expanded maximum borrowing capacity														1,800,000
Number of Banks Supporting the Credit Facility																		19
Commitment fee (as a percent)															0.50%	0.30%
Outstanding borrowings under credit facility																	268,000
Letters of Credit Outstanding																	2,291
Remaining availability under credit facility																	454,709
Effective interest rate (as a percent)							2.00%		2.30%								2.00%
Commitment fees and letters of credit fees																						$ 449	$ 377	$ 1,049	$ 866
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												3.5	3.4
Revolving Credit and Term Leverage Ratio, Maximum Allowable												5.5	5.5
Bond Leverage Ratio, per Indentures												4.1	3.9
Bond Leverage Ratio, per Indentures, Maximum Allowable												6.5	6.5
Revolving Credit and Term Loan Fixed Charge Coverage Ratio												1.4	1.5
Revolving Credit and Term Loan Fixed Charge Coverage Ratio, Minimum Allowable												1.2	1.2