Income Taxes - Effective income tax reconciliation (Details)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Effective Income Tax Rate, Tax Rate Reconciliation
Statutory rate	35.00%	35.00%	35.00%
Effect of:
State and local income taxes, net of federal tax benefit	5.10%	4.40%	2.10%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent	19.40%	(9.60%)	0.40%
Reserve for uncertain tax positions	(48.70%)	35.70%	(7.30%)
Amended returns and settlements	0.00%	16.60%	0.00%
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent	5.80%	9.50%	(0.40%)
Effective income tax rate	16.60%	91.60%	29.80%

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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 the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, that is attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority interest income (expense), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, change in enacted tax rate, prior year income taxes, change in deferred tax asset valuation allowance, and other adjustments.

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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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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 income tax contingencies. Includes, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies.

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