Income Taxes (Unrecognized tax benefits - rollforward and discussion) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Tax Contingency [Line Items]
Balance, beginning of period	$ 10,500,000	$ 5,091,000	$ 20,920,000
Additions based on tax positions related to the current year	24,000	4,933,000	1,332,000
Additions for tax positions of prior years	699,000	2,055,000	1,243,000
Reductions for tax positions of prior years	(2,248,000)	(557,000)	(17,456,000)
Reductions related to settlements with tax authorities		0	(281,000)
Reduction from lapse of statutes of limitations	(57,000)	(1,019,000)	(667,000)
Balance, end of period	7,900,000	10,500,000	5,091,000
Income tax contingency [Abstract]
Unrecognized Tax Benefits, Period Increase (Decrease)	(2,600,000)
Decrease in Income Tax Expense Related to Unrecognized Tax Benefit	900,000
Liability for Uncertain Tax Positions, Noncurrent	4,300,000
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit	6,200,000
Benefit for interest and penalties	300,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	200,000
Revenue Attribution [Member]
Income tax contingency [Abstract]
Unrecognized Tax Benefits, Period Increase (Decrease)	(1,800,000)
Contested Prior Year Deductions In Foreign Jurisdictions [Member]
Income Tax Contingency [Line Items]
Reductions related to settlements with tax authorities	$ (1,000,000)