Income Taxes Schedule of income (loss) before income taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
United States	$ 25,417	$ 11,186	$ 13,194
Foreign	6,598	8,944	(16,340)
Income (loss) before income taxes	$ 32,015	$ 20,130	$ (3,146)