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Stock-Based Compensation - 2012 SAR Award Narrative (Details) - SARs $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
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Jul. 31, 2015 USD ($) $ / shares shares | Jun. 30, 2015 $ / shares shares | Jun. 30, 2014 shares | Jun. 30, 2012 USD ($) valuation_date anniversary shares | Jun. 30, 2016 USD ($) $ / shares shares | Dec. 31, 2017 shares | Dec. 31, 2016 shares | Dec. 31, 2015 USD ($) shares | Dec. 31, 2014 USD ($) shares | Dec. 31, 2013 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  | 5,000 | 106,800 | 60,000 | 0 |
Exercised (in shares) |  |  |  |  |  | 0 | 0 | 0 | 120,000 |
Expired (in shares) |  |  |  |  |  | 6,750 | 61,291 | 0 | 0 |
Forfeited (in shares) |  |  |  |  |  | 67,130 | 195,490 | 0 | 0 |
2012 SAR |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  | 543,872 |  |  |  |  |  |
Exercise price (in dollars per share) | $ / shares |  | $ 22.07 |  |  | $ 22.07 |  |  |  |  |
Number of grant date anniversaries | anniversary |  |  |  | 3 |  |  |  |  |  |
Contractual term |  |  |  | 10 years |  |  |  |  |  |
Number of valuation dates to trigger SAR shares to be exercisable | valuation_date |  |  |  | 7 |  |  |  |  |  |
Number of consecutive valuation dates needed | valuation_date |  |  |  | 10 |  |  |  |  |  |
Discount rate |  |  |  | 15.00% |  |  |  |  |  |
Resulting fair value per share (in dollars per share) | $ / shares |  |  |  |  | $ 3.31 |  |  |  |  |
Aggregate compensation expense | $ |  |  |  | $ 1.8 |  |  |  |  |  |
Period until market condition will be met |  |  |  | 1 year 9 months 11 days |  |  |  |  |  |
Unvested shares (in shares) |  | 181,290 |  |  |  |  |  |  |  |
Period for deferred vesting |  | 30 days |  |  |  |  |  |  |  |
Exercised (in shares) |  |  |  |  |  |  |  |  | 120,000 | 181,291
Vested (in shares) |  |  | 181,291 |  |  |  |  |  |  |
Expired (in shares) |  |  |  |  | 61,291 |  |  |  |  |
Forfeited (in shares) |  |  |  |  | 181,290 |  |  |  |  |
Previously recognized expensed now reversed | $ |  |  |  |  | $ 0.1 |  |  |  |  |
2012 SAR | Selling, General and Administrative Expenses |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Aggregate compensation expense | $ |  |  |  |  |  |  |  | $ 0.2 | $ 0.3 |
SAR And Bonus Agreement |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Limit of sale of any vested SAR | $ | $ 0.8 |  |  |  |  |  |  |  |  |
Period without written consent of the compensation committee | 6 months |  |  |  |  |  |  |  |  |
Annual bonus | $ | $ 0.3 |  |  |  |  |  |  |  |  |
Incremental compensation expense (in dollars per share) | $ / shares | $ 1.84 |  |  |  |  |  |  |  |  |
Incremental compensation expense from modification | $ | $ 0.3 |  |  |  |  |  |  |  |  |
SAR And Bonus Agreement | Tranche one |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Unvested shares (in shares) | 100,000 |  |  |  |  |  |  |  |  |
SAR And Bonus Agreement | Tranche two |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Unvested shares (in shares) | 81,290 |  |  |  |  |  |  |  |  |

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- Definition Carrying value as of the balance sheet date of obligations incurred and payable for incentive compensation awarded to employees and directors or earned by them based on the terms of one or more relevant arrangements. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6935-107765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6911-107765 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 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.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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=109197908&loc=d3e5070-113901 + Details
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