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Income Taxes - Reconciliation of The Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Income tax expense computed at statutory rate	$ 46,538	$ 42,136	$ 31,418
Increases (decreases) resulting from:
State income taxes, net of federal tax benefit	3,661	5,064	4,015
Federal jobs credits	(4,193)	(4,550)	(3,900)
Tax exempt interest	(568)	(457)	(132)
Other, net	(699)	798	339
Tax provision	$ 44,739	$ 42,991	$ 31,740

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Effective Income Tax Rate Reconciliation, Increases (Decreases) [Abstract]

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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
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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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