Stock-Based Compensation (Details 2) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number Outstanding	598,346
Weighted Average Exercise Price	$ 16.26
Number Exercisable	167,389
Weighted Average Exercise Price	$ 24.93
$ 0.00-$10.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number Outstanding	284,866
Weighted Average Exercise Price	$ 9.34
Weighted Average Remaining Contractual Life	9 years 0 months 15 days
Number Exercisable	11,034
Weighted Average Exercise Price	$ 10.00
Weighted Average Remaining Contractual Life	4 years 1 month 2 days
$10.00-$20.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number Outstanding	121,540
Weighted Average Exercise Price	$ 15.51
Weighted Average Remaining Contractual Life	8 years 5 months 5 days
Number Exercisable	33,646
Weighted Average Exercise Price	$ 17.33
Weighted Average Remaining Contractual Life	8 years 1 month 8 days
$20.00-$30.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number Outstanding	176,777
Weighted Average Exercise Price	$ 25.68
Weighted Average Remaining Contractual Life	6 years 10 months 17 days
Number Exercisable	107,546
Weighted Average Exercise Price	$ 26.37
Weighted Average Remaining Contractual Life	6 years 3 months 7 days
$30.00-$40.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number Outstanding	9,566
Weighted Average Exercise Price	$ 38.25
Weighted Average Remaining Contractual Life	2 years 5 months 9 days
Number Exercisable	9,566
Weighted Average Exercise Price	$ 38.25
Weighted Average Remaining Contractual Life	2 years 5 months 9 days
$40.00-$50.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number Outstanding	3,336
Weighted Average Exercise Price	$ 48.50
Weighted Average Remaining Contractual Life	3 years 0 months 11 days
Number Exercisable	3,336
Weighted Average Exercise Price	$ 48.50
Weighted Average Remaining Contractual Life	3 years 0 months 11 days
$50.00-$60.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number Outstanding	2,261
Weighted Average Exercise Price	$ 51.40
Weighted Average Remaining Contractual Life	1 year 1 month 21 days
Number Exercisable	2,261
Weighted Average Exercise Price	$ 51.40
Weighted Average Remaining Contractual Life	1 year 1 month 21 days

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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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- Definition

Weighted average remaining contractual term of exercisable stock options, 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)(2)

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

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- Definition

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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- Definition

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.

+ 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)-(ii)

-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 could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ 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)-(ii)

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

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- Definition

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.

+ 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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