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Stock-Based Compensation Schedule of Unvested Restricted Stock Units Activity (Details) - RSUs - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Summary of Expected to Vest RSUs [Line Items]
Unvested RSUs, shares	1,612,424	1,873,737
RSUs granted during the period	743,926
RSUs vested, shares	(858,470)
RSUs forfeited/canceled, shares	(146,769)
RSUs expected to vest, shares	1,555,391
Unvested RSUs, weighted average grant date fair value	$ 29.58	$ 27.58
RSUs granted, weighted average grant date fair value	31.77
RSUs vested, weighted average grant date fair value	26.85
RSUs forfeited/canceled, weighted average grant date fair value	31.15
RSUs expected to vest, weighted average grant date fair value	$ 29.56
ShareBasedCompensationArrangementByShareBasedPaymentAwardRSUsAndRestrictedStockExpectedToVestOutstandingWeightedAverageRemainingContractualTerm	2 years 8 months 9 days
RSUs expected to vest, aggregate intrinsic value	$ 55,979

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- Definition

As of the balance sheet date, the weighted-average exercise price for outstanding share based compensation awards other than stock options that are expected to vest.

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Equity awards expected to vest other than options

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As of the balance sheet date, the total intrinsic value of expected to vest equity awards other than options.

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- Definition

The weighted-average period between the balance sheet date and vesting date for expected to vest equity awards other than options outstanding.

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- Definition

[Line Items] for Summary of Expected to Vest RSUs, Stock Options, and Restricted Stock

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ 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 (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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-Paragraph 2
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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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-Publisher FASB
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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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-Name Accounting Standards Codification
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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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