Goodwill and Other Intangible Assets Estimated Future Amortization Expense (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Goodwill [Line Items]
Amortization expense, intangible assets	$ 19,900,000	$ 19,300,000	$ 11,000,000
2013	20,384,000
2014	13,451,000
2015	7,062,000
2016	1,689,000
Thereafter	11,000
Estimated future amortization expense, intangible assets, total	$ 42,597,000