Income Taxes (Details 2)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Effective tax rate reconciliation
Statutory U.S. federal tax rate	35.00%	35.00%	35.00%
Increase (decrease) in rate resulting from:
Effect of qualified domestic production deduction	(1.40%)	(0.40%)	(0.80%)
Effect of Patient Protection and Affordable Care Act		0.90%	(0.60%)
Effect of noncontrolling interest	(2.50%)	(1.30%)	1.10%
State and local income taxes, net of related federal taxes	2.70%	2.00%	3.00%
Other, net	(0.40%)	(0.20%)	(0.60%)
Effective tax rate	33.40%	36.00%	37.10%

Effective income tax rate reconciliation patient protection and affordable care act.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for qualified production activity.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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