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Stock Based Compensation (Tables)

9 Months Ended

Sep. 30, 2016

Stock Based Compensation [Abstract]

Stock Based Compensation Expense

The following table provides information regarding the Company's stock-based compensation expense (in thousands):

	Three months ended September 30,								Nine months ended September 30,
	2016				2015				2016				2015
Stock based compensation		$	21,388			$	17,597			$	60,480			$	47,035
Tax effect recognized in net income			7,486				6,159				21,168				16,462
Windfall tax benefit/(shortfall), net			-				2,132				-				10,887

Windfall tax benefits are no longer calculated due to the adoption of the ASU related to stock compensation (see Note 2), as all tax benefits are recognized in net income.

Weighted Average Assumptions Used to Value Option Grants

		Nine months ended September 30,
		2016				2015
Risk-free interest rate (%)			1.38				1.52
Expected option life (years)			5.20				5.10
Expected volatility (%)			21.63				22.23
Expected dividend yield (%)			0.70				0.62

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- References

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- Definition

Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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