Fair Value of Financial Instruments Financial Instruments Carried at Historical Costs (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	$ 1,667,316,000	$ 1,858,135,000
Fair Value	1,662,844,000	1,844,260,000
Revolving credit facility [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	15,869,000	25,153,000
Fair Value	15,881,000	25,222,000
United States term loan [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	1,458,659,000	1,576,100,000
Fair Value	1,454,387,000	1,562,385,000
Canadian term loan [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	0	14,446,000
Fair Value	0	14,353,000
Australian term Loan [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	148,980,000	190,100,000
Fair Value	149,092,000	191,057,000
Amortizing notes component of TEUs [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	24,477,000	32,435,000
Fair Value	24,205,000	31,484,000
Other debt [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying Value	19,331,000	19,901,000
Fair Value	$ 19,279,000	$ 19,759,000