Income Taxes - Narrative (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Operating Loss Carryforwards [Line Items]
Federal statutory tax rate	35.00%	35.00%	35.00%
Additional tax expense related to penalties and interest incurred	$ 99,000
State
Operating Loss Carryforwards [Line Items]
Net operating loss carryforward	2,400,000
Internal Revenue Service (IRS)
Operating Loss Carryforwards [Line Items]
Net operating loss carryforward	4,800,000
Cash benefits received from operating loss carrybacks	13,100,000
Taxable income deferred due to change in tax accounting	$ 10,900,000