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Stock-based Compensation
 3 Months Ended
Mar. 31, 2020
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 March 31,
(in thousands)
 
2020
 
2019
Stock-settled awards:
 
 
 
 
SARs
 
$
—

 
$
6

RSUs
 
3,219

 
2,407

Restricted stock
 
8

 
10

Cash-settled performance units
 
142

 
2,065

Total
 
$
3,369

 
$
4,488


 
(in thousands except period data)
March 31, 2020
Unrecognized compensation expense related to unvested stock-settled awards
$
34,996

Weighted average period over which expense is expected to be recognized, in years
3.3