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Share-based Compensation | 9 Months Ended
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Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Share-based Compensation | Share-based Compensation Long-term Incentive Plan ("LTIP") In the first quarter of 2016, 2017 and 2018, the Compensation Committee of the Board of Directors approved grants of restricted stock units (“RSUs”) to executives and certain employees pursuant to the 2016 LTIP, 2017 LTIP and 2018 LTIP, respectively, all under the terms of our 2013 Equity Incentive Plan. Additionally, in the fourth quarter of 2017, a special retention grant to certain executives and employees of the Company was approved. Under the LTIPs, the Company granted restricted stock units to eligible participants as time-based awards and/or performance-based awards. The vesting of the RSUs is dependent upon service, market, and/or performance conditions as defined in the grants. Employees that received time-based awards with service conditions are entitled to receive a specific number of shares of the Company’s common stock on the vesting date if the employee is providing services to the Company on the vesting date. Time-based awards vest over a period of three years in substantially equal installments commencing on the grant date and ending on February 19 of each year for the 2016 LTIP, on February 24 of each year for the 2017 LTIP and on February 28 of each year for the 2018 LTIP. Employees that received awards with market conditions under the 2016 LTIP are entitled to receive a specific number of shares of the Company’s common stock on the vesting date if the Company’s total shareholder return (“TSR”) target relative to a specified group of industry peer companies is achieved. Employees that received awards with performance conditions are entitled to receive a specific number of shares of the Company’s common stock on the vesting date if the Cumulative Annual Growth Rate (“CAGR”) of Diluted EPS target over one year is achieved for the 2016 LTIP. The shares earned according to the plan are further subject to a two-year service vesting period. For the performance-based awards under the 2017 LTIP and 2018 LTIP, the Compensation Committee established adjusted earnings before income taxes, depreciation and amortization ("Adjusted EBITDA") as the primary performance measure while maintaining focus on total shareholder return through the use of a market-based TSR performance modifier. The TSR modifier adjusts the shares earned based on the core Adjusted EBITDA performance upwards or downwards (+/- 25%) based on the Company’s relative TSR at the end of the three-year performance period as compared to the companies in the Russell 2000 Index. The Adjusted EBITDA performance measure will be calculated for the one-year period commencing on January 1 of the year of the grant and ending on December 31 of the same year, relative to the goals set by the Compensation Committee for this same period. The shares earned will be subject to a further two-year service vesting period. Performance and market-based awards vest at the end of the performance period that commenced on February 19, 2016 for the 2016 LTIP, February 24, 2017 for the 2017 LTIP and February 28, 2018 for the 2018 LTIP. The periods end on February 19, 2019 for the 2016 LTIP, February 24, 2020 for the 2017 LTIP and February 28, 2021 for the 2018 LTIP. Awards are forfeited if the employee voluntarily ceases to be employed by the Company prior to vesting. The following table summarizes nonvested restricted shares and RSUs activity for the nine months ended September 30, 2018:
Nonvested restricted shares and RSUs |  | Shares |  | Weighted-average grant date fair value
Nonvested at December 31, 2017 |  | 2,340,892 |  |  | $ | 15.08 |
Forfeited |  | (382,371 | ) |  | 17.32 |
Vested |  | (461,097 | ) |  | 18.29 |
Granted |  | 636,322 |  |  | 17.07 |
Nonvested at September 30, 2018 |  | 2,133,746 |  |  | $ | 15.02 |
For the three and nine months ended September 30, 2018, the Company recognized $2.4 million and $9.7 million of share based compensation expense, respectively, compared with $2.4 million and $6.6 million, respectively for the same periods in 2017. As of September 30, 2018, the maximum unrecognized cost for restricted stock and RSUs was $19.9 million. The cost is expected to be recognized over a weighted average period of 1.93 years.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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