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Income Taxes - Tax Reconciliation (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Reconciliation to effective federal income tax rate
Federal statutory rate	34.00%	34.00%
Stock options	1.20%	12.10%
State taxes	2.10%	2.30%
Other permanent differences	0.70%	5.30%
Impact of uncertain tax positions	1.70%	5.50%
Other	(0.10%)	(0.70%)
Effective federal income tax rate	39.60%	58.50%

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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 other nondeductible expenses.

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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 equity-based compensation costs.

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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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