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Stock-Based Compensation (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Mar. 20, 2016 | May 07, 2013
Stock-Based Compensation |  |  |  |  |  |  |
Stock-based compensation expense (in dollars) |  | $ 1.5 | $ 1.7 | $ 2.8 | $ 5.8 |  |
Stock Options |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |
Number of share options granted during the period (in shares) |  |  |  | 1,800,000 | 400,000 |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |
Number of shares of other than options granted during the period (in shares) |  |  |  | 1,400,000 | 400,000 |  |
Restricted Stock |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |
Number of shares of other than options granted during the period (in shares) | 400,000 |  |  | 300,000 |  |  |
Restricted Stock | Officers and Employees |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |
Expiration period of restrictions (in years) |  |  |  | 3 years |  |  |
Restricted Stock | 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
Shares available for future grant (in shares) |  |  |  |  |  | 28,184,595 |
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 improvement in total leverage ratio |  |  |  | 50.00% |  |  |
Period for meeting performance goals |  |  |  | 3 years |  |  |
Performance Shares 2016 | Minimum | Performance Shares |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |
Number of shares of other than options granted during the period (in shares) |  |  |  | 0 |  |  |
Performance Shares 2016 | Maximum | Performance Shares |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |
Number of shares of other than options granted during the period (in shares) |  |  |  | 1,600,000.0 |  |  |
Performance Shares 2014 | Minimum | Performance Shares |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |
Number of shares of other than options granted during the period (in shares) |  |  |  | 0 |  |  |
Performance Shares 2014 | Maximum | Performance Shares |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |
Number of shares of other than options granted during the period (in shares) |  |  |  | 100,000.0 |  |  |

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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 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 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 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 The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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