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Stock-Based Compensation (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended
--- | --- | ---
Apr. 30, 2015 | Mar. 31, 2016 | Mar. 31, 2015
Stock-Based Compensation |  |  |
Stock-based compensation expense (in dollars) |  | $ 1.3 | $ 4.1
Stock Options |  |  |
Stock-Based Compensation |  |  |
Number of share options granted during the period (in shares) |  | 1,700,000 | 600,000
Restricted Stock Units (RSUs) |  |  |
Stock-Based Compensation |  |  |
Number of shares of other than options granted during the period (in shares) |  | 1,300,000 | 500,000
Restricted Stock |  |  |
Stock-Based Compensation |  |  |
Number of shares of other than options granted during the period (in shares) | 400,000 |  |
Officers and Employees | Restricted Stock |  |  |
Stock-Based Compensation |  |  |
Expiration period of restrictions (in years) |  | 3 years |
Director | Restricted Stock |  |  |
Stock-Based Compensation |  |  |
Expiration period of restrictions (in years) |  | 2 years |
2013 Omnibus Plan |  |  |
Stock-Based Compensation |  |  |
Share-based compensation, shares authorized (in shares) |  | 8,000,000 |
Shares available for future grant (in shares) |  | 28,184,595 |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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