Income Taxes (Income Tax Reconciliation) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Income before income taxes	$ 82,487	$ 63,487	$ 53,717
Federal income tax expense at statutory rate	28,871	22,221	18,801
Increases (decreases) resulting from:
State income taxes, net of federal income tax benefits	4,817	2,204	3,009
Impact of non-controlling interest	(4,290)	88	0
Non-deductible expenses	2,581	2,698	3,311
Impact of domestic production deduction	(248)	(1,889)	(2,026)
Tax credits	(275)	(433)	0
Inclusion of tax liabilities from unincorporated entities	1,374	0	0
Changes in valuation allowance, net of equity and tax audit adjustments	421	(94)	0
Income tax expense	$ 33,251us-gaap_IncomeTaxExpenseBenefit	$ 24,795us-gaap_IncomeTaxExpenseBenefit	$ 23,095us-gaap_IncomeTaxExpenseBenefit

This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.

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

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Amount 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 increase (decrease) in the valuation allowance for deferred tax assets.

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Amount 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 attributable to deduction for qualified production activity.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Amount 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 noncontrolling interest income (loss) exempt from income taxes.

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Amount 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 tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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