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Income Taxes - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Unrecognized tax benefits	$ 2,800,000	$ 1,300,000
Interest and penalties	$ 0	$ 18,000
Effective income tax rate (as percent)	19.00%	25.80%
Federal and State income tax statutory rate (as percent)	26.14%	39.23%
Excess tax benefit	$ 2,700,000	$ 3,800,000

X

- Definition

Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount

+ References

No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32698-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h)(2))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
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-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
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-Subparagraph (SAB TOPIC 6.I)
-URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817

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-Topic 740
-SubTopic 10
-Section 50
-Paragraph 13
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The sum of the amounts of estimated penalties and interest recognized in the period arising from income tax examinations.

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-Publisher FASB
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Amount of unrecognized tax benefits.

+ References

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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6527854

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