Income Taxes (Details 3) (USD $)	3 Months Ended								6 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Jun. 30, 2013	Jun. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current tax provision:
State													$ 1,141,000	$ 1,183,000	$ 1,047,000
Total current tax provision													1,141,000	1,183,000	1,047,000
Tax benefit relating to a work opportunity tax credit program													1,468,000
Deferred tax (benefit) provision:
Federal													(1,042,000)	4,775,000	(44,384,000)
State													1,817,000	1,140,000	(15,052,000)
Total deferred tax provision (benefit)													775,000	5,915,000	(59,436,000)
Total tax provision (benefit)	(164,000)	(1,533,000)	621,000	(2,139,000)	(672,000)	(3,633,000)	(654,000)	58,389,000	(912,000)	(4,287,000)	(1,076,000)	(4,959,000)	1,916,000	7,098,000	(58,389,000)
Difference between the entity's effective tax (benefit) rate on continuing operations and the U.S. Federal statutory income tax (benefit) rate
Taxes at statutory U.S. federal income tax rate (as a percent)													35.00%	35.00%	35.00%
State and local income taxes, net of federal tax benefit (as a percent)													36.00%	8.70%	(12.90%)
Tax credits (as a percent)													(42.10%)	(4.20%)	(15.70%)
Change in valuation allowance (as a percent)													2.60%	0.10%	(348.10%)
Nondeductible meals and entertainment													1.70%	0.50%	0.50%
Nondeductible penalties													1.70%	0.70%	1.00%
Dividend received deduction													(1.10%)	(0.80%)	(0.90%)
Executive compensation													1.60%	0.30%	0.00%
Stock-based compensation													0.60%	0.10%	(1.20%)
Other differences, net (as a percent)													(0.10%)	(0.30%)	2.20%
Effective tax rate (as a percent)													35.90%	40.10%	(340.10%)
Reconciliation of the beginning and ending amount of unrecognized tax benefits
Unrecognized tax benefits at beginning of the year			1,086,000				893,000		1,086,000	893,000	1,086,000	893,000	1,086,000	893,000
Additions for tax positions of prior years															717,000
Additions for tax positions of current year													159,000	193,000	176,000
Unrecognized tax benefits at end of the year				1,086,000				893,000					1,245,000	1,086,000	893,000
Amount of unrecognized tax benefits, if recognized would decrease effective tax rate in a future period													$ 0