Stock-Based Compensation Non-Qualified Stock Options Activity (Details) - NSO	6 Months Ended
Jun. 30, 2017 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, beginning of period (shares)	2,396,160
Granted (shares)	931,913
Exercised (shares)	(350,711)
Forfeitures (shares)	(375,634)
Cancelled (shares)	(70,714)
Adjustment due to the 2017 Special Cash Dividend	452,738
Outstanding, end of period (shares)	2,983,752
Vested and exercisable, shares end of period (shares)	1,247,501
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Outstanding, beginning of period, weighted average exercise price (usd per share) \| $ / shares	$ 45.82
Granted, weighted average exercise price (usd per share) \| $ / shares	32.12
Exercised, weighted average exercise price (usd per share) \| $ / shares	28.55
Forfeitures, weighted average exercise price (usd per share) \| $ / shares	28.95
Cancellations, weighted average exercise price (usd per share) \| $ / shares	47.85
Outstanding, end of period, weighted average exercise price (usd per share) \| $ / shares	38.66
Vested and exercisable, weighted average exercise price, end of period (usd per share) \| $ / shares	$ 47.70

Adjustments to stock options related to a special cash dividend.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(4)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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- Definition

As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are fully vested or expected to vest.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of share options (or share units) exercised during the current period.

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