Income Taxes Uncertain Tax Positions (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Line Items]
Gross liability for uncertain tax positions	$ 11,600,000
Federal effects of potential state tax exposures	8,300,000
Tax provision included, not yet reduced income tax payments	5,200,000
Anticipate Significant Change to Uncertain Income Tax within Next Twelve Months	3,100,000
Long-term income taxes payable	2,759,000	6,404,000	5,660,000
Accrued Income Taxes, Current	300,000
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at January 1, 2012	8,532,000
Additions based on tax positions related to the current year	487,000
Additions for tax positions related to prior years	77,000
Subtractions for tax positions related to prior years	(837,000)
Balance at December 31, 2012	8,259,000
Previously unrecognized tax benefits, recognized in 2012 due to expiration of statutes of limitations	661,000
Accrued interest related to income tax matters	354,000	376,000
Undistributed earnings of foreign subsidiaries	5,300,000	4,900,000
Long-Term Income Taxes Payable [Member]
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Accrued interest related to income tax matters	320,000
Current Income Taxes Payable [Member]
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Accrued interest related to income tax matters	$ 34,000