Stock-Based Compensation	3 Months Ended
Mar. 31, 2022
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-Based Compensation	16. Stock-Based Compensation Equity compensation awards may be granted to certain eligible employees or non-employee directors. A detailed description of the awards granted prior to 2022 is included in the Company’s 2021 Annual Report on Form 10-K. The total number of shares of the Company’s common stock available for awards under the Company’s 2013 Omnibus Incentive Plan is 7,477,395 shares. The total number of shares of the Company’s common stock still available for issuance as of March 31, 2022 is 3,738,692 shares. Stock-based compensation expense was $3.1 million and $2.5 million for the three months ended March 31, 2022 and 2021, respectively, which was recorded in engineering, selling, and administrative expense in the Condensed Consolidated Statement of Operations. The Company recognizes stock-based compensation expense over the award’s vesting period, subject to retirement, death or disability provisions of the 2013 Omnibus Incentive Plan. A total of 321,983 and 316,974 restricted stock units were issued by the Company to employees during the three months ended March 31, 2022 and 2021, respectively. The restricted stock units granted to employees vest in three annual increments over a three-year period beginning on the grant date. A total of 198,334 and 203,697 performance shares units were issued by the Company to employees during the three months ended March 31, 2022 and 2021, respectively. Performance share units vest after three years and are earned based on the extent to which performance goals are met over the applicable performance period. The performance goals and the applicable performance period vary for each grant year. The performance goals for the performance share units granted in 2022 are weighted 60% on the 3-year average of the Company’s adjusted EBITDA percentage from 2022 to 2024 and 40% on non-new machine sales for the year ending December 31, 2024. The Company defines non-new machine sales as parts sales, used crane sales, rental revenue, service revenue and other revenue. The 2022 performance share units include a +/-20% modifier weighted on total shareholder return relative to a defined peer group of companies during the three-year performance period, not to exceed 200% of target shares granted. The performance goals for the performance share units granted in 2021 are weighted 60% on the 3-year average of the Company’s adjusted EBITDA percentage from 2021 to 2023 and 40% on non-new machine sales for the year ending December 31, 2023. The 2021 performance share units include a +/-20% modifier weighted on total shareholder return relative to a defined peer group of companies during the three-year performance period, not to exceed 200% of target shares granted. The Company issued a total of 56,640 and 56,672 equity grants to non-employee directors during the three months ended March 31, 2022 and 2021, respectively. The 2022 and 2021 non-employee director equity compensation awards vested immediately upon the grant date.

Stock-Based Compensation

3 Months Ended

Mar. 31, 2022

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

16. Stock-Based Compensation

Equity compensation awards may be granted to certain eligible employees or non-employee directors. A detailed description of the awards granted prior to 2022 is included in the Company’s 2021 Annual Report on Form 10-K. The total number of shares of the Company’s common stock available for awards under the Company’s 2013 Omnibus Incentive Plan is 7,477,395 shares. The total number of shares of the Company’s common stock still available for issuance as of March 31, 2022 is 3,738,692 shares.

Stock-based compensation expense was $3.1 million and $2.5 million for the three months ended March 31, 2022 and 2021, respectively, which was recorded in engineering, selling, and administrative expense in the Condensed Consolidated Statement of Operations. The Company recognizes stock-based compensation expense over the award’s vesting period, subject to retirement, death or disability provisions of the 2013 Omnibus Incentive Plan.

A total of 321,983 and 316,974 restricted stock units were issued by the Company to employees during the three months ended March 31, 2022 and 2021, respectively. The restricted stock units granted to employees vest in three annual increments over a three-year period beginning on the grant date.

A total of 198,334 and 203,697 performance shares units were issued by the Company to employees during the three months ended March 31, 2022 and 2021, respectively. Performance share units vest after three years and are earned based on the extent to which performance goals are met over the applicable performance period. The performance goals and the applicable performance period vary for each grant year. The performance goals for the performance share units granted in 2022 are weighted 60% on the 3-year average of the Company’s adjusted EBITDA percentage from 2022 to 2024 and 40% on non-new machine sales for the year ending December 31, 2024. The Company defines non-new machine sales as parts sales, used crane sales, rental revenue, service revenue and other revenue. The 2022 performance share units include a +/-20% modifier weighted on total shareholder return relative to a defined peer group of companies during the three-year performance period, not to exceed 200% of target shares granted.

The performance goals for the performance share units granted in 2021 are weighted 60% on the 3-year average of the Company’s adjusted EBITDA percentage from 2021 to 2023 and 40% on non-new machine sales for the year ending December 31, 2023. The 2021 performance share units include a +/-20% modifier weighted on total shareholder return relative to a defined peer group of companies during the three-year performance period, not to exceed 200% of target shares granted.

The Company issued a total of 56,640 and 56,672 equity grants to non-employee directors during the three months ended March 31, 2022 and 2021, respectively. The 2022 and 2021 non-employee director equity compensation awards vested immediately upon the grant date.