Share-Based Compensation - Summary of Options Outstanding (Details) (USD $)	3 Months Ended
Mar. 31, 2015
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Outstanding, Number (in shares)	414,894
Weighted Average Remaining Contractual Life	6 years 3 months 18 days
Exercisable, Number (in shares)	212,430
Weighted Average Exercise Price (in usd per share)	$ 12.95
$5.39 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price (in usd per share)	$ 5.39
Outstanding, Number (in shares)	35,000
Weighted Average Remaining Contractual Life	6 years 10 months 2 days
Exercisable, Number (in shares)	35,000
Weighted Average Exercise Price (in usd per share)	$ 5.39
$9.07-$9.56 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, minimum (in usd per share)	$ 9.07
Range of exercise prices, maximum (in usd per share)	$ 9.56
Outstanding, Number (in shares)	122,394
Weighted Average Remaining Contractual Life	8 years 2 months 1 day
Exercisable, Number (in shares)	36,930
Weighted Average Exercise Price (in usd per share)	$ 9.19
$11.03 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price (in usd per share)	$ 11.03
Outstanding, Number (in shares)	109,500
Weighted Average Remaining Contractual Life	9 years 1 month 24 days
Exercisable, Number (in shares)	0
Weighted Average Exercise Price (in usd per share)	$ 0.00
$12.12 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price (in usd per share)	$ 12.12
Outstanding, Number (in shares)	7,500
Weighted Average Remaining Contractual Life	9 years 3 months 26 days
Exercisable, Number (in shares)	0
Weighted Average Exercise Price (in usd per share)	$ 0.00
$14.47 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price (in usd per share)	$ 14.47
Outstanding, Number (in shares)	78,000
Weighted Average Remaining Contractual Life	2 years 10 months 6 days
Exercisable, Number (in shares)	78,000
Weighted Average Exercise Price (in usd per share)	$ 14.47
$16.00-$16.50 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of exercise prices, minimum (in usd per share)	$ 16.00
Range of exercise prices, maximum (in usd per share)	$ 16.50
Outstanding, Number (in shares)	32,500
Weighted Average Remaining Contractual Life	1 year 8 months 19 days
Exercisable, Number (in shares)	32,500
Weighted Average Exercise Price (in usd per share)	$ 16.04
$19.10 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price (in usd per share)	$ 19.10
Outstanding, Number (in shares)	30,000
Weighted Average Remaining Contractual Life	10 months 2 days
Exercisable, Number (in shares)	30,000
Weighted Average Exercise Price (in usd per share)	$ 19.10
$19.17 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise price (in usd per share)	$ 19.17

Share-Based Compensation, Shares Authorized Under Stock Option Plans, Exercise Price

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- Definition

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)

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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)

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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.

+ 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)

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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

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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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