Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Alternative minimum tax carryback refund			$ 9,600,000
Income refund receivable			5,600,000
Federal tax benefits	(229,000)	(3,213,000)	(4,038,000)
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	19,200,000
Change in unrecognized tax benefits	0	1,693,000	0
Unrecognized tax benefits	19,184,000	8,376,000	9,255,000
Stock Compensation Plan [Member]
Unrecognized Tax Benefits Resulting in Net Operating Loss Carryforward	87,100,000	55,300,000
Operating loss carryforwards	200,000,000
Discrete Events, Including Acquisitions [Member]
Federal tax benefits			19,800,000
Alternative Minimum Tax Credit Carryforward [Member]
Income refund receivable			4,000,000
U.S. Federal [Member]
Operating loss carryforwards	2,700,000,000
Change in unrecognized tax benefits	(3,200,000)
U.S. Federal [Member] | Starting [Member]
Operating loss carryforwards, expiration dates	2021
U.S. Federal [Member] | Ending [Member]
Operating loss carryforwards, expiration dates	2032
State [Member]
Operating loss carryforwards	1,400,000,000
State [Member] | Starting [Member]
Operating loss carryforwards, expiration dates	2013
State [Member] | Ending [Member]
Operating loss carryforwards, expiration dates	2032
Foreign [Member]
Operating loss carryforwards	$ 100,000,000