Share-Based Compensation - Summary of Stock Options (Details) (USD $)	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at beginning of period, shares	452,530	337,696
Granted, shares	0	0
Forfeited or expired, shares	(30,000)	0
Exercised, shares	(7,636)	0
Stock dividend or split, shares	0	0
Outstanding at end of period, shares	414,894	337,696
Exercisable at end of period, shares	212,430	197,833
Weighted Average Exercise Price (in usd per share)	$ 12.95
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Outstanding at beginning of period, Weighted Average Exercise Price Per Share (in dollars per share)	$ 12.09	$ 12.43
Granted, Weighted Average Exercise Price Per Share (in dollars per share)	$ 0.00	$ 0.00
Forfeited or expired, Weighted Average Exercise Price per Share (in dollars per share)	$ 19.17	$ 0.00
Exercised, Weighted Average Exercise Price per Share (in dollars per share)	$ 7.87	$ 0.00
Stock dividend or split, Weighted Average Exercise Price per Share (in dollars per share)	$ 0.00	$ 0.00
Outstanding at end of period, Weighted Average Exercise Price per Share (in dollars per share)	$ 11.58	$ 12.43
Weighted Average Exercise Price per Share, Exercisable (in dollars per share)		$ 14.96

Share based compensation arrangement by share based payment award options stock dividend or splits.

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- Definition

Share based compensation arrangements by share based payment award options stock dividend or split weighted average exercise price.

+ References

No definition available.

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- 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

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- Definition

For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

+ 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)(iv)(3)-(4)

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

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- Definition

Weighted average price of options that were either forfeited or expired.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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-Paragraph 2

-Subparagraph (c)(1)(iv)(3)-(4)

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

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- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

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- Definition

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

+ References

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-Publisher FASB

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-Topic 718

-SubTopic 10

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- Definition

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

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

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- Definition

Weighted average price at which option holders acquired shares when converting their stock options into shares.

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- Definition

Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

+ References

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- Definition

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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Number of share options (or share units) exercised during the current period.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

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-Publisher SEC

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