Impairment and Other Charges - Rollfoward of Impairments and Other Charges (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Restructuring Reserve [Roll Forward]
Accruals	$ 11,000	$ 12,950	$ 22,046	$ 0
Accounts Payable and Accured Liabilities [Member]
Restructuring Reserve [Roll Forward]
Beginning balance		22,046
Accruals		25,759
Payments		(12,809)
Ending balance	34,996	34,996
Accounts Payable and Accured Liabilities [Member] | Post Acquisition Charges [Member]
Restructuring Reserve [Roll Forward]
Beginning balance		22,046
Accruals		0
Payments		(7,320)
Ending balance	14,726	14,726
Accounts Payable and Accured Liabilities [Member] | Severance [Member]
Restructuring Reserve [Roll Forward]
Beginning balance		0
Accruals		14,753
Payments		(4,876)
Ending balance	9,877	9,877
Accounts Payable and Accured Liabilities [Member] | Restructuring Activities [Member]
Restructuring Reserve [Roll Forward]
Beginning balance		0
Accruals		11,006
Payments		(613)
Ending balance	$ 10,393	$ 10,393