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Stock-Based Compensation - Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Mar. 20, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | May 07, 2013
Stock-Based Compensation |  |  |  |  |  |
Stock-based compensation expense (in dollars) |  | $ 1.5 | $ 1.0 | $ 4.7 | $ 3.8 |
Number of share options granted during the period (in shares) |  | 0 | 0 | 1,100,000 | 1,800,000 |
Restricted Stock Units (RSUs) |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |
Number of shares of other than options granted during the period (in shares) |  | 0 | 0 | 500,000 | 600,000 |
Restricted Stock Units (RSUs) | Officers And Employees | Minimum |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |
Expiration period of restrictions (in years) |  |  |  | 1 year |  |
Restricted Stock Units (RSUs) | Officers And Employees | Maximum |  |  |  |  |  |
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 |  |
Performance Shares |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |
Number of shares of other than options granted during the period (in shares) |  | 0 | 0 | 500,000 | 800,000 |
Options Granted in 2017 | Stock Options |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |
Vesting period (in years) |  |  |  | 3 years |  |
Expiration period (in years) |  |  |  | 10 years |  |
Options Granted 2016 | Stock Options |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |
Vesting period (in years) |  |  |  |  | 4 years |
Expiration period (in years) |  |  |  |  | 10 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 |  |  |  |  |
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% |
Performance period (in years) |  |  |  |  | 3 years |
Percentage of shares paid based on weighted average return on investment (as a percent) |  |  |  |  | 50.00% |
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 |

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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=96867065&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=96867065&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=96867065&loc=d3e5070-113901 + Details
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