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Income Taxes - Narrative (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 State	Dec. 31, 2012 Internal Revenue Service (IRS)	Mar. 31, 2013 Internal Revenue Service (IRS)
Operating Loss Carryforwards [Line Items]
Effective Income Tax Rate, Continuing Operations	36.80%	36.00%
Federal statutory tax rate	35.00%
Net operating loss carryforward			$ 2.4		$ 4.8
Cash benefits received from operating loss carrybacks				$ 13.1

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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