Stock-Based Compensation - Schedule of Stock Options Outstanding (Details) - Jun. 30, 2015 - Amended Plan - $ / shares	Total	Total
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Number of shares - outstanding, December 31, 2014		4,671,639
Number of shares - granted	0	0
Number of shares - exercised		(5,880)
Number of shares - forfeited		0
Number of shares - expired		(5,457)
Number of shares - outstanding, June 30, 2015	4,660,302	4,660,302
Number of shares - exercisable, June 30, 2015	1,827,403	1,827,403
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]
Weighted average exercise price per share - outstanding, December 31, 2014 (in usd per share)		$ 5.88
Weighted average exercise price per share - granted (in usd per share)		0.00
Weighted average exercise price per share - exercised (in usd per share)		7.36
Weighted average exercise price per share - forfeited (in usd per share)		0.00
Weighted average exercise price per share - expired (in usd per share)		6.12
Weighted average exercise price per share - outstanding, June 30, 2015 (in usd per share)	$ 5.88	5.88
Weighted average exercise price per share - exercisable, June 30, 2015 (in usd per share)	$ 5.76	$ 5.76

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.

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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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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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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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.

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Gross 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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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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 price at which grantees could have acquired the underlying shares with respect to stock options of the plan that expired.

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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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