Basis of Presentation and Significant Accounting Policies - Intangible Assets (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Aug. 31, 2012
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets	$ 16,800,000	$ 23,400,000	$ 10,100,000
Finite-lived intangible assets, amortization expense, 2013	10,600,000
Finite-lived intangible assets, amortization expense, 2014	4,600,000
Finite-lived intangible assets, amortization expense, 2015	2,600,000
Finite-lived intangible assets, amortization expense, 2016	2,600,000
Finite-lived intangible assets, amortization expense, 2017	2,600,000
Finite-lived intangible assets, amortization expense, thereafter	1,500,000
Goodwill	$ 31,886,000	$ 31,886,000	$ 31,094,000	$ 31,886,000
Trademarks [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, average useful life	14 years
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, average useful life	4 years