Share-Based Compensation - Summary of Stock Option Activity (Details) (USD $)	12 Months Ended
Dec. 31, 2014
Shares
Outstanding, beginning of period (in shares)	1,398,090
Granted (in shares)	87,090
Exercised (in shares)	(207,687)
Forfeited or Expired (in shares)	(43,582)
Outstanding, end of period (in shares)	1,233,911
Exercisable, end of period (in shares)	668,130
Weighted Average Exercise Price
Outstanding, beginning of period (weighted average exercise price)	$ 7.23
Granted (weighted average exercise price)	$ 20.30
Exercised (weighted average exercise price)	$ 6.34
Forfeited or Expired (weighted average exercise price)	$ 11.11
Outstanding, end of period (weighted average exercise price)	$ 8.16
Exercisable, end of period (weighted average exercise price)	$ 6.36

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.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iii)

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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.

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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.

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

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

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

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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

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

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

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