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STOCK BASED AND DEFERRED COMPENSATION (Tables)
 3 Months Ended
Mar. 31, 2021
Share-based Payment Arrangement [Abstract]  
Summary of Compensation Expense and Stock Award Activity Below is a summary of compensation expense and stock award activity (dollars in thousands):
 Three Months Ended March 31,
 20212020
Stock-based compensation expense$5,367 $6,437 
Non-vested shares granted221,552 223,481 
Performance-based non-vested shares granted 46,593 56,139 
Performance-based shares issued in excess of target shares granted (1)
37,425 24,054 
Restricted stock awards vested (includes performance-based awards)434,729 398,346 
(1)Performance-based shares that vested and were issued as a result of performance achievement exceeding the originally established targeted number of shares related to respective performance metrics.
Summary of Additional Information Regarding Stock Plan
The following table includes additional information regarding our stock compensation plan (dollars in thousands):
 As of
 March 31, 2021December 31, 2020
Unrecognized stock-based compensation cost$39,322 $22,687 
Weighted average years expense recognition period2.242.01
Total equity awards outstanding (1)
962,772 1,098,545 
(1)Includes unvested restricted stock, performance-based awards (assuming 100% payout) and restricted stock units.