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Income Taxes (Tables)

3 Months Ended

Mar. 31, 2018

Income Tax Disclosure [Abstract]

Schedule Of Interest And Penalties

	March 31, 2018				December 31, 2017
Gross liability for unrecognized tax benefits, exclusive of interest and penalties	$	14,685			$	14,480
Interest and penalties on unrecognized benefits	1,218				1,175
Total gross uncertain tax positions	$	15,903			$	15,655
Amount included in Current liabilities	$	2,944			$	3,275
Amount included in Other long-term liabilities	12,959				12,380
	$	15,903			$	15,655

Schedule of Effective Income Tax Rate Reconciliation

The Company's effective income tax rate for the three months ended March 31, 2018 and 2017 differs from the federal income tax statutory rate due to the following:

		Three Months Ended March 31,
		2018			2017
Statutory rate		21.0	%		35.0	%
State taxes, net of federal tax benefit		2.2			1.5
Foreign tax expense and tax rate differential		(0.2	)		(0.8	)
Tax benefit from stock option exercises		(10.8	)		(4.2	)
Other, net		(0.3	)		(0.5	)
		11.9	%		31.0	%

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- References

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- Definition

Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from 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 12
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319

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Tabular disclosure for tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities and other income tax contingencies. Includes, but is not limited to, interest and penalties, reconciliation of unrecognized tax benefits, unrecognized tax benefits that would affect the effective tax rate, tax years that remain subject to examination by tax jurisdictions, and information about positions for which it is reasonably possible that amounts unrecognized will significantly change within 12 months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 19
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32840-109319

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