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Stock-based Compensation
6 Months Ended
Jun. 30, 2021
Compensation Related Costs [Abstract]  
Stock-based Compensation Stock-based Compensation
We have long-term incentive plans under which stock-based compensation awards are granted to employees and directors by the board of directors, or its designated committee. Grants are subject to vesting requirements and may include, among other things, nonqualified stock options, stock appreciation rights (“SARs”), restricted stock units (“RSUs”), restricted stock and performance units, or any combination thereof. There are 2,550,000 total shares authorized for grant under the plans.
The table below summarizes our stock-based compensation expense:
 Three months ended June 30,Six months ended June 30,
(in thousands)2021202020212020
Stock-settled awards:
RSUs$8,315 $3,313 $13,775 $6,532 
Restricted stock— 17 
Cash-settled units121 338 1,028 480 
Total$8,436 $3,660 $14,804 $7,029 
 
(in thousands except period data)June 30, 2021
Unrecognized compensation expense related to unvested stock-settled awards$45,429 
Weighted average period over which expense is expected to be recognized, in years2.3