Income Taxes - Income Taxes (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
Provision for income taxes	$ 800,000	$ 2,200,000	$ 5,200,000
Provision for income taxes	1,699,000	3,060,000	8,815,000
Discontinued Operation, Tax Effect of Discontinued Operation	$ 900,000		$ 3,600,000