Fair Value of Financial Instruments Financial Instruments Carried at Historical Costs (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying value	$ 1,737,579	$ 1,858,135
Fair value	1,729,511	1,844,260
Revolving credit facility [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying value	26,996	25,153
Fair value	26,992	25,222
United States term loan [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying value	1,514,300	1,576,100
Fair value	1,508,365	1,562,385
Canadian term loan [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying value	0	14,446
Fair value	0	14,353
Australian term loan [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying value	149,763	190,100
Fair value	148,203	191,057
Amortizing notes component of TEUs [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying value	27,048	32,435
Fair value	26,569	31,484
Other debt [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Carrying value	19,472	19,901
Fair value	$ 19,382	$ 19,759