Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended		12 Months Ended
	Jun. 30, 2011	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Income Tax Disclosure [Abstract]
Effective tax rate	27.60%	26.20%	16.40%	16.80%
Tax items related to prior year tax adjustments	$ 1,793	$ 1,793