Income Taxes Narrative (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Operating Loss Carryforwards [Line Items]
Effective income tax rates	28.70%	30.10%	32.10%
Statutory U.S. federal income tax rate	35.00%	35.00%	35.00%
Changes In Unrecognized Tax Positions		$ 1,400,000
Expense (benefit) from Foreign Operations, Change in Estimate	4,500,000
Tax Adjustments, Settlements, and Unusual Provisions		1,400,000
Additional Current Federal Tax Expense (Benefit)		2,800,000
Unrecognized Tax Benefits	4,415,000	4,570,000	6,017,000	4,246,000
Settlements and lapsing of statutes of limitations	565,000	3,682,000	774,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	0	0	1,300,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	2,300,000	1,900,000
Undistributed Earnings of Foreign Subsidiaries	122,000,000
Scenario, Forecast [Member]
Operating Loss Carryforwards [Line Items]
Settlements and lapsing of statutes of limitations	$ 2,100,000