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Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Tax Disclosure [Abstract]
Income taxes	$ 3,566	$ 16,948
Valuation Allowance [Line Items]
Income tax benefit related to excess tax benefits associated with vesting of RSUs	200
Retained Earnings [Member] | Accounting Standards Update 2018-02 [Member]
Valuation Allowance [Line Items]
Deferred tax benefit reclassified from AOCI to Retained Earnings	400
AOCI Attributable to Parent [Member] | Accounting Standards Update 2018-02 [Member]
Valuation Allowance [Line Items]
Deferred tax benefit reclassified from AOCI to Retained Earnings	$ (400)

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- Definition

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

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Amount 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 9
-Subparagraph (a),(b)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319

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))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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