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Employee Stock Plans | 3 Months Ended
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Mar. 31, 2021
Stock Based Compensation |
Stock Based Compensation | 13.Employee Stock Plans ​ 2010 Stock Incentive Plan ​ In May 2010, the Company’s Board of Directors and stockholders adopted the 2010 Stock Incentive Plan (the “2010 Plan”). The material terms of the performance goals under the 2010 Plan, as amended and restated, were approved by stockholders at the Company’s 2014 annual meeting of stockholders and the plan’s term was extended further by the stockholders at the Company’s 2020 annual meeting of stockholders. The 2010 Plan provides for the issuance of nonqualified stock options, incentive stock options, stock appreciation rights, restricted stock awards and restricted stock units (“RSUs”), any of which may be performance-based, and for incentive bonuses, which may be paid in cash or stock or a combination of both, to eligible employees, officers, non-employee directors and other service providers to the Company and its subsidiaries. A maximum of 2,130,000 shares of common stock may be issued pursuant to all awards under the 2010 Plan. ​ Equity awards issued to management include a retirement provision under which members of management who either (1) are age 65 or older or (2) have at least ten years of service and are at least age 55 will continue to vest in unvested equity awards upon retirement. The retirement provision also stipulates that the employee remain employed by the Company for six months after the first day of the fiscal year of the grant. As the retirement provision does not qualify as a substantive service condition, the Company incurred $859 and $303 in the three months ended March 31, 2021 and 2020, respectively, in additional expense for employees who meet the thresholds of the retirement provision. In 2013, the Company’s nominating and governance committee approved a retirement provision for the RSUs issued to non-employee directors that accelerates the vesting of such awards upon retirement. Such awards are fully expensed immediately upon grant in accordance with ASC 718, as the retirement provision eliminates substantive service conditions associated with the awards. ​ Performance Share Unit Awards ​ The Company grants performance share units as performance-based awards under the 2010 Plan that are subject to performance conditions over a three year performance period beginning in the year of the grant. Upon meeting the prescribed performance conditions, employees will be issued shares which vest immediately at the end of the measurement period. In accordance with ASC 718, such awards are being expensed over the vesting period from the date of grant through the requisite service period, based upon the most probable outcome. The fair value per share of the awards is the closing stock price on the date of grant, which was $49.96. The Company recognized $811 and $484 of compensation expense related to the awards in the three months ended March 31, 2021 and 2020, respectively. The unrecognized compensation expense calculated under the fair value method for shares that were, as of March 31, 2021 expected to be earned through the requisite service period was approximately $4,807 and is expected to be recognized through 2024. ​ Restricted Stock Unit Awards ​ RSUs are granted to both non-employee directors and management. RSUs do not carry voting rights. While all non-employee director RSUs participate in dividend equivalents, there are two classes of management RSUs, one that participates in dividend equivalents, and a second that does not participate in dividend equivalents. Each RSU represents the right to receive one share of the Company’s common stock and is subject to time-based vesting restrictions. Participants are not required to pay any consideration to the Company at either the time of grant of a RSU or upon vesting. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ A summary of RSU activity for the three months ended March 31, 2021 is as follows: ​ ​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Weighted | ​ | Average
​ | ​ | ​ | ​ | Average | ​ | Remaining
​ | ​ | ​ | ​ | Grant Date | ​ | Contractual
​ | ​ | Shares | ​ | Fair value | ​ | Term
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unvested at December 31, 2020 | ​ | 36,022 | ​ | $ | 42.73 | ​ | 1.40 | years
Granted | ​ | 132,316 | ​ | $ | 44.49 | ​ | 1.42 | years
Vested | ​ | (86,375) | ​ | $ | 39.69 | ​ | ​ | ​
Cancelled and forfeited | ​ | (835) | ​ | $ | 44.49 | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Unvested at March 31, 2021 | ​ | 81,128 | ​ | $ | 48.81 | ​ | 1.62 | years
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Expected to vest in the future at March 31, 2021 | ​ | 80,317 | ​ | $ | 48.81 | ​ | 1.62 | years
​ The Company recognized $1,154 and $884 of compensation expense related to the RSU awards in the three months ended March 31, 2021 and 2020, respectively. The unrecognized compensation expense calculated under the fair value method for shares that were, as of March 31, 2021, expected to be earned through the requisite service period was approximately $3,575 and is expected to be recognized through 2024. ​ For grants to non-employee directors, vesting occurs as of the grant date. Vested director RSUs are ‘‘settled’’ by the delivery to the participant or a designated brokerage firm of one share of common stock per vested RSU as soon as reasonably practicable following a termination of service of the participant that constitutes a separation from service, and in all events no later than the end of the calendar year in which such termination of service occurs or, if later, two and one-half months after such termination of service. Vested management RSUs are “settled” by the delivery to the participant or a designated brokerage firm of one share of common stock per vested RSU as soon as reasonably practicable following vesting.

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