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Stock-Based Compensation - Exercise Price Range (Details) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding - Number Outstanding	648	650	924	1,412
Options Outstanding - Weighted-Average Remaining Years of Contractual Life	4 years 10 months 5 days	5 years 7 months 2 days	6 years 1 month 3 days
Options Outstanding - Weighted-Average Exercise Price	$ 30.50	$ 25.56	$ 22.04	$ 20.56
Options Exercisable - Number Exercisable	493	421	671
Options Exercisable - Weighted-Average Exercise Price	$ 25.03	$ 23.84	$ 22.62
$17.60 to $21.95
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Range Limit	17.60
Range of Exercise Prices, Upper Range Limit	$ 21.95
Options Outstanding - Number Outstanding	279
Options Outstanding - Weighted-Average Remaining Years of Contractual Life	5 years 3 months 25 days
Options Outstanding - Weighted-Average Exercise Price	$ 20.23
Options Exercisable - Number Exercisable	257
Options Exercisable - Weighted-Average Exercise Price	$ 20.26
24.91 to 29.25
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Range Limit	24.91
Range of Exercise Prices, Upper Range Limit	$ 29.25
Options Outstanding - Number Outstanding	163
Options Outstanding - Weighted-Average Remaining Years of Contractual Life	3 years 3 months 3 days
Options Outstanding - Weighted-Average Exercise Price	$ 27.99
Options Exercisable - Number Exercisable	163
Options Exercisable - Weighted-Average Exercise Price	$ 27.99
35.28 to 35.35
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Range Limit	35.28
Range of Exercise Prices, Upper Range Limit	$ 35.35
Options Outstanding - Number Outstanding	128
Options Outstanding - Weighted-Average Remaining Years of Contractual Life	5 years 17 days
Options Outstanding - Weighted-Average Exercise Price	$ 35.28
Options Exercisable - Number Exercisable	73
Options Exercisable - Weighted-Average Exercise Price	$ 35.28
51.38 to 65.54
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, Lower Range Limit	51.38
Range of Exercise Prices, Upper Range Limit	$ 65.54
Options Outstanding - Number Outstanding	78
Options Outstanding - Weighted-Average Remaining Years of Contractual Life	6 years 2 months 1 day
Options Outstanding - Weighted-Average Exercise Price	$ 64.81
Options Exercisable - Number Exercisable	0
Options Exercisable - Weighted-Average Exercise Price	$ 0.00

X

- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently 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 (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock 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 (c)(1)(iii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

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

+ References

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

Reference 2: 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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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock 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 (c)(1)(i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

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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- Definition

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

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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- Definition

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

+ 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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