Income Taxes (Contingencies) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at January 1	$ 6,400,000	$ 6,900,000	$ 2,500,000
Additions based on tax positions related to the current year	0	0	0
Additions for tax positions of prior years	500,000	900,000	4,400,000
Reductions for tax positions of prior years	0	0	0
Reductions for expirations of statute of limitations	0	0	0
Settlements	(100,000)	(1,400,000)	0
Balance at December 31	6,800,000	6,400,000	6,900,000
Unrecognized tax benefits, accumulated interest and penalties	4,500,000	4,000,000	3,700,000
Deferred tax assets related to unrecognized tax benefits	5,500,000	5,200,000	4,800,000
Net unrecognized tax benefits, associated interest, penalties and deferred tax asset that if resolved would impact effective tax rate	5,800,000	5,200,000	5,700,000
Recognized penalties as part of provision for income taxes	0	0	0
Unrecognized Tax Benefits, Interest on Income Taxes Expense	$ 300,000	$ 300,000	$ 300,000