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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Income taxes
Valuation allowance		$ 0
Additional first year bonus depreciation (as a percent)	50.00%
Federal income tax bonus deduction		3.1
Federal
Income taxes
Net operating loss resulting from repairs and maintenance deductions		26.0
State
Income taxes
Net operating loss resulting from repairs and maintenance deductions		$ 55.7

The amount of the valuation allowance recorded as of the balance sheet date pertaining to the specified deferred tax asset for which an assessment was made that it is more likely than not that all or a portion of such deferred tax asset will not be realized through related deductions on future tax returns.

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