Stock Plans - Unrecognized Share-based Compensation Costs (Details) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
Dec. 31, 2017 USD ($) $ / shares shares
Unrecognized share-based compensation costs
Unrecognized Share-Based Compensation Costs	$ 32,510
Weighted Average Period Expected to be Recognized	2 years 8 months 12 days
Stock option Awards
Unrecognized share-based compensation costs
Unrecognized Share-Based Compensation Costs	$ 12
Weighted Average Period Expected to be Recognized	3 months 18 days
Vested
Number of Shares \| shares	1,389
Weighted Average Exercise Price \| $ / shares	$ 34.99
Weighted Average Remaining Contractual Life	3 years 10 months 24 days
Expected to vest
Number of shares \| shares	5
Weighted Average Exercise Price \| $ / shares	$ 30.18
Weighted Average Remaining Contractual Life	4 years 2 months 12 days
Total
Number of shares \| shares	1,394
Weighted Average Exercise Price \| $ / shares	$ 34.97
Weighted Average Remaining Contractual Life	3 years 10 months 24 days
Closing price \| $ / shares	$ 14.85
Restricted stock units
Unrecognized share-based compensation costs
Unrecognized Share-Based Compensation Costs	$ 6,157
Weighted Average Period Expected to be Recognized	2 years 9 months 18 days
Restricted Stock Awards
Unrecognized share-based compensation costs
Unrecognized Share-Based Compensation Costs	$ 21,656
Weighted Average Period Expected to be Recognized	2 years 7 months 6 days
Performance Share Units
Unrecognized share-based compensation costs
Unrecognized Share-Based Compensation Costs	$ 4,685
Weighted Average Period Expected to be Recognized	2 years 1 month 6 days

Unrecognized cost of unvested share-based compensation awards.

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

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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.

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

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- Definition

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

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

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Price of a single share of a number of saleable stocks of a company.

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

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

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Weighted average remaining contractual term for fully vested options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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