Uncertain Tax Positions (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Uncertainties [Abstract]
Unrecognized tax benefits	$ 22,798,000	$ 25,423,000	$ 35,400,000	$ 34,689,000
Unrecognized tax benefits that would impact effective tax rate	12,300,000	11,700,000
Unrecognized tax benefits, income tax and interest penalties (benefits)	200,000	200,000	500,000
Unrecognized tax benefits, income tax penalties and interest accrued	1,800,000	1,600,000	1,800,000
Decrease in unrecognized tax benefits within 12 months	$ 5,500,000