Income Taxes - Valuation Allowance (Details) (USD $)	3 Months Ended								12 Months Ended			15 Months Ended	36 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Sep. 30, 2012	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Income (loss) before income taxes	$ (38,531,000)	$ 811,000	$ 1,614,000	$ 3,471,000	$ 2,714,000	$ 6,063,000	$ (15,183,000)	$ (1,295,000)	$ (32,635,000)	$ (7,701,000)	$ (1,401,000)	$ 14,700,000	$ (41,737,000)
Goodwill impairment							4,900,000		0	4,943,872	0
Tax loss position									$ (32,635,000)	$ (2,757,000)	$ (1,401,000)		$ (36,793,000)
Cumulative tax loss position									3 years