Fair Value of Financial Instruments Financial Instruments Carried at Historical Cost(Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	$ 1,858,135	$ 626,194
Fair Value	1,844,260	620,285
Revolving credit facility
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	25,153	191,919
Fair Value	25,222	186,590
United States term loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	1,576,100	190,000
Fair Value	1,562,385	183,869
Canadian term loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	14,446	21,983
Fair Value	14,353	21,226
Australia term loan
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	190,100	89,443
Fair Value	191,057	88,299
TEUs - Amortizing Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	32,435	0
Fair Value	31,484	0
Series B senior notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	0	100,000
Fair Value	0	107,704
Series C senior notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	0	25,000
Fair Value	0	24,822
Other Debt Obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	19,901	7,849
Fair Value	$ 19,759	$ 7,775