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Stock-Based Compensation (Details) - USD ($) $ in Millions |  | 3 Months Ended |
--- | --- | --- | ---
Mar. 20, 2016 | Mar. 31, 2017 | Mar. 31, 2016 | May 07, 2013
Stock-Based Compensation |  |  |  |
Stock-based compensation expense (in dollars) |  | $ 2.2 | $ 1.3 |
Restricted Stock Units (RSUs) |  |  |  |
Stock-Based Compensation |  |  |  |
Number of shares of other than options granted during the period (in shares) |  | 1,000,000 | 1,300,000 |
Restricted Stock Units (RSUs) | Officers and Employees |  |  |  |
Stock-Based Compensation |  |  |  |
Expiration period of restrictions (in years) |  | 3 years |  |
Restricted Stock Units (RSUs) | Director |  |  |  |
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
Additional shares authorized (in shares) | 22,100,000.0 |  |  |
Performance Shares 2017 | Performance Shares |  |  |  |
Stock-Based Compensation |  |  |  |
Percentage of shares paid based on total shareholder return relative to peer group (as a percent) |  | 50.00% |  |
Percentage of shares paid based on adjusted EBITDA (as a percent) |  | 50.00% |  |
Performance period (in years) |  | 3 years |  |
Performance Shares 2017 | Performance Shares | Minimum |  |  |  |
Stock-Based Compensation |  |  |  |
Number of shares of other than options granted during the period (in shares) |  | 0 |  |
Performance Shares 2017 | Performance Shares | Maximum |  |  |  |
Stock-Based Compensation |  |  |  |
Number of shares of other than options granted during the period (in shares) |  | 900,000 |  |
Performance Shares 2016 | Performance Shares |  |  |  |
Stock-Based Compensation |  |  |  |
Percentage of shares paid based on total shareholder return relative to peer group (as a percent) |  |  | 50.00% |
Percentage of shares paid based on weighted average return on investment (as a percent) |  |  | 50.00% |
Performance period (in years) |  | 3 years |  |
Performance Shares 2016 | Performance Shares | Minimum |  |  |  |
Stock-Based Compensation |  |  |  |
Number of shares of other than options granted during the period (in shares) |  |  | 0 |
Performance Shares 2016 | Performance Shares | Maximum |  |  |  |
Stock-Based Compensation |  |  |  |
Number of shares of other than options granted during the period (in shares) |  |  | 1,200,000 |
Options Granted in 2017 |  |  |  |
Stock-Based Compensation |  |  |  |
Number of share options granted during the period (in shares) |  | 1,100,000 |  |
Options Granted in 2017 | Stock Options |  |  |  |
Stock-Based Compensation |  |  |  |
Exercisable increment (as a percent) |  | 33.00% |  |
Vesting period (in years) |  | 3 years |  |
Expiration period (in years) |  | 10 years |  |
Options Granted 2016 |  |  |  |
Stock-Based Compensation |  |  |  |
Number of share options granted during the period (in shares) |  |  | 1,700,000 |
Options Granted 2016 | Stock Options |  |  |  |
Stock-Based Compensation |  |  |  |
Exercisable increment (as a percent) |  |  | 25.00% |
Vesting period (in years) |  |  | 4 years |
Expiration period (in years) |  |  | 10 years |

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- Definition The date when the restrictions on the equity-based award expires as specified in the award agreement. + References No definition available. + Details
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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 + Details
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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, 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 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + 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 Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Number of additional shares authorized for issuance under an established share-based compensation plan. + References No definition available. + 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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- Definition Net number of share options (or share units) granted during the period. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Percentage of vesting of share-based compensation awards. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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