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Stock-Based Compensation - Stock Options by Exercise Price Ranges (Details)	12 Months Ended
	Dec. 31, 2016 $ / shares shares
Outstanding options
Number outstanding (in shares) | shares	6,326,593
Weighted-average remaining contractual life	3 years 11 months 5 days
Weighted-average exercise price (in dollars per share)	$ 11.17
Exercisable options
Number outstanding (in shares) | shares	3,110,050
Weighted-average exercise price (in dollars per share)	$ 11.03
$6.76 to $10.26
Information about stock options outstanding
Low end of exercise price range (in dollars per share)	6.76
High end of exercise price range (in dollars per share)	$ 10.26
Outstanding options
Number outstanding (in shares) | shares	2,229,210
Weighted-average remaining contractual life	1 year 6 months 18 days
Weighted-average exercise price (in dollars per share)	$ 8.10
Exercisable options
Number outstanding (in shares) | shares	1,805,807
Weighted-average exercise price (in dollars per share)	$ 9.53
$11.12 to $15.45
Information about stock options outstanding
Low end of exercise price range (in dollars per share)	11.12
High end of exercise price range (in dollars per share)	$ 15.45
Outstanding options
Number outstanding (in shares) | shares	4,026,349
Weighted-average remaining contractual life	5 years 2 months 19 days
Weighted-average exercise price (in dollars per share)	$ 12.76
Exercisable options
Number outstanding (in shares) | shares	1,288,869
Weighted-average exercise price (in dollars per share)	$ 13.06
$16.59 to $18.61
Information about stock options outstanding
Low end of exercise price range (in dollars per share)	16.59
High end of exercise price range (in dollars per share)	$ 18.61
Outstanding options
Number outstanding (in shares) | shares	71,034
Weighted-average remaining contractual life	5 years 8 months 23 days
Weighted-average exercise price (in dollars per share)	$ 17.26
Exercisable options
Number outstanding (in shares) | shares	15,374
Weighted-average exercise price (in dollars per share)	$ 17.86

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The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

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

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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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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)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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

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The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

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

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

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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)
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