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Stock-Based Compensation - Schedule of Fair Value Assumptions (Details) - SARs - $ / shares | 1 Months Ended | 12 Months Ended |
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Feb. 29, 2016 | Oct. 31, 2015 | Jul. 31, 2015 | Jun. 30, 2015 | Jun. 30, 2012 | Dec. 31, 2017 | Jun. 30, 2016
2012 SAR |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Market value closing price of the Common Stock (in dollars per share) |  |  |  | $ 53.64 |  |  | $ 16.50
Exercise price (in dollars per share) |  |  |  | $ 22.07 |  |  | $ 22.07
Risk-free interest rate |  |  |  | 1.10% | 0.92% |  |
Expected volatility |  |  |  | 50.00% | 55.00% |  |
Expected term |  |  |  | 3 years 6 months | 6 years |  |
Dividend yield |  |  |  | 0.00% | 0.00% |  |
Fair value of the Common Stock (in dollars per share) |  |  |  | $ 31.97 |  |  |
2012 SAR Bonus Agreement |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Market value closing price of the Common Stock (in dollars per share) |  |  | $ 51.13 |  |  |  |
Exercise price (in dollars per share) |  |  | $ 22.07 |  |  |  |
Risk-free interest rate |  |  | 1.53% |  |  |  |
Expected volatility |  |  | 50.00% |  |  |  |
Expected term |  |  | 4 years 10 months 24 days |  |  |  |
Dividend yield |  |  | 0.00% |  |  |  |
Fair value of the Common Stock (in dollars per share) |  |  | $ 33.81 |  |  |  |
2015 SARs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Market value closing price of the Common Stock (in dollars per share) |  | $ 24.41 |  |  |  |  |
Exercise price (in dollars per share) |  | $ 24.41 |  |  |  |  |
Risk-free interest rate |  | 1.76% |  |  |  |  |
Expected volatility |  | 50.00% |  |  |  |  |
Expected term |  | 7 years 3 months |  |  |  |  |
Dividend yield |  | 0.00% |  |  |  |  |
February 2016 SAR awards |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Market value closing price of the Common Stock (in dollars per share) | $ 10.76 |  |  |  |  |  |
Exercise price (in dollars per share) | $ 11.25 |  |  |  |  |  |
Risk-free interest rate | 1.36% |  |  |  |  |  |
Expected volatility | 55.00% |  |  |  |  |  |
Expected term | 5 years 9 months |  |  |  |  |  |
Dividend yield | 0.00% |  |  |  |  |  |
2017 SARs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Market value closing price of the Common Stock (in dollars per share) |  |  |  |  |  | $ 7.37 |
Exercise price (in dollars per share) |  |  |  |  |  | $ 7.37 |
Risk-free interest rate |  |  |  |  |  | 2.10% |
Expected volatility |  |  |  |  |  | 58.50% |
Expected term |  |  |  |  |  | 6 years |
Dividend yield |  |  |  |  |  | 0.00% |

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- Definition Agreed-upon price for the exchange of the underlying asset relating to the share-based payment award. + References No definition available. + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=109197908&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 Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.D.2) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 + Details
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