Income Taxes (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$ 632,000	$ (2,731,000)	$ 700,000	$ (2,051,000)
Effective Income Tax Rate, Continuing Operations	10.30%	6.30%	6.50%	4.90%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate			35.00%
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Lower Bound	500,000		500,000
Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Estimated Range of Change, Upper Bound	$ 2,000,000		$ 2,000,000