Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Tax Expense (Benefit) [Line Items]
Net operating loss carryforwards, state	$ 200,000
Net operating loss carryforwards, foreign	34,200,000
Deferred income taxes, undistributed earnings	2,200,000	2,000,000
Impact of repatriation, net of foreign tax credits	0	0
Unrecognized tax benefits, impact on effective tax rate	2,700,000	3,500,000	3,000,000
Accrued interest and penalties	5,300,000	5,700,000	5,600,000
Increase (decrease) in income tax expense	(300,000)	400,000	(2,800,000)
Unrecognized tax benefits, gross	$ 4,900,000
Foreign Countries [Member]
Income Tax Expense (Benefit) [Line Items]
Net operating loss carry forwards expiring in and beyond the stated year	2014
States [Member]
Income Tax Expense (Benefit) [Line Items]
Net operating loss carry forwards expiring in and beyond the stated year	2013