Income Taxes (Details) (USD $)	9 Months Ended
	Sep. 30, 2013	Apr. 30, 2013
Income Taxes
Unrecognized tax benefits	$ 28,000
Accrued interest	295,000
Unrecognized tax benefits for which the liability for such taxes was recognized as deferred tax liabilities	0
Unrecognized tax benefits that would affect the effective tax rate if recognized	0
Accrued taxes, interest and penalties payable to the IRS		1,800,000
Amount paid under settlement to the IRS	550,000
Reversal of accrued income taxes and related interest resulting from the entity's settlement with the IRS	$ 500,000