Share-Based Compensation - Summary of Information on Stock Options Outstanding and Exercisable (Details) (USD $)	12 Months Ended
Dec. 31, 2014
Summary of information concerning stock options outstanding and exercisable
Options Outstanding, Shares	247,590
Options Outstanding, Weighted-Average Remaining Contractual Life	3 years 6 months
Options Outstanding, Weighted-Average Exercise Price	$ 17.82
Options Exercisable, Shares	247,590
Options Exercisable, Weighted-Average Exercise Price	$ 17.82
Range One
Summary of information concerning stock options outstanding and exercisable
Range of Exercise Prices, upper limit	$ 16.62
Options Outstanding, Shares	224,137
Options Outstanding, Weighted-Average Remaining Contractual Life	3 years 9 months 18 days
Options Outstanding, Weighted-Average Exercise Price	$ 16.62
Options Exercisable, Shares	224,137
Options Exercisable, Weighted-Average Exercise Price	$ 16.62
Range Two
Summary of information concerning stock options outstanding and exercisable
Range of Exercise Prices, upper limit	$ 29.27
Options Outstanding, Shares	23,453
Options Outstanding, Weighted-Average Remaining Contractual Life	2 months 12 days
Options Outstanding, Weighted-Average Exercise Price	$ 29.27
Options Exercisable, Shares	23,453
Options Exercisable, Weighted-Average Exercise Price	$ 29.27

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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

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-Subparagraph (c)(1)(iii)

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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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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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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

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-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)-(ii)

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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

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-Paragraph 2

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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

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)

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