Income Taxes (Effective tax rate reconciliation) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Federal tax	$ 22,282	$ 34,336	$ 3,881
State income taxes, net of federal tax provision (benefit)	(366)	293	(196)
Foreign income taxed at lower tax rates	(6,356)	(5,050)	(14,536)
Subpart F income and foreign dividends, net of foreign tax credits	1,115	1,786	12,346
Valuation allowance - foreign tax credit carryforwards	(5,843)	(6,503)	(1,933)
Liability for unrecognized tax benefits	107	1,109	1,390
U.S. provision-to-return adjustments	(167)	(2,345)	(1,663)
Valuation allowance - net operating loss carryforwards	0	(5,820)	1,840
Other	(615)	33	173
Income tax provision (benefit), Total	$ 10,157	$ 17,839	$ 1,302
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Income tax rate, Federal tax	35.00%	35.00%	35.00%
Income tax rate, State income taxes	(0.60%)	0.30%	(1.80%)
Income tax rate, Foreign income taxed at lower tax rates	(10.00%)	(5.20%)	(131.10%)
Income tax rate, Subpart F income and foreign dividends	1.80%	1.80%	111.30%
Income tax rate, Valuation allowance - foreign tax credit carryforwards	(9.20%)	(6.60%)	(17.40%)
Income tax rate, Liability for unrecognized tax benefits	0.20%	1.10%	12.50%
Income tax rate, U.S. provision-to-return adjustment	(0.30%)	(2.40%)	(15.00%)
Income tax rate, Valuation allowance - net operating loss carryforwards	0.00%	(5.90%)	16.60%
Income tax rate, Other	(1.00%)	0.10%	1.60%
Income tax rate, Total	15.90%	18.20%	11.70%