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STOCK BASED AND DEFERRED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Summary of Nonvested (Restricted) Shares and Units Activity
We grant time-based and performance-based restricted shares or units. Performance-based restricted shares are only granted to executive officers. All performance shares only vest upon the attainment of certain financial and operational criteria as established and approved by our Board of Directors. The number of shares that may be issued to the award recipients may be greater or lesser than the target award amount depending on actual performance achieved as compared to the performance targets set forth in the awards.
 
Nonvested
Restricted Share
Activity
(time-based)		Weighted
Average
Grant Date
Fair Value		Nonvested
Restricted
Share Activity
(performance-
based)		Weighted
Average
Grant Date
Fair Value
Outstanding at January 1, 2017962,303  $37.00  184,968  $34.84  
Granted430,575  34.45  154,120  34.10  
Vested (Earned/Released)(279,856) 38.39  (20,367) 45.60  
Forfeited (1)(130,370) 35.09  (31,716) 45.60  
Outstanding as of December 31, 2017982,652  35.59  287,005  35.80  
Granted315,247  46.07  157,637  45.20  
Vested (Earned/Released)(288,709) 37.93  (36,801) 41.17  
Forfeited (1)(85,900) 37.53  (29,386) 41.17  
Outstanding at December 31, 2018923,290  38.25  378,455  38.77  
Granted (2)385,328  44.46  115,191  40.46  
Vested (Earned/Released) (2)(347,555) 37.15  (87,737) 34.39  
Forfeited (1)(126,443) 40.45  —  —  
Outstanding at December 31, 2019834,620  $41.25  405,909  $40.20  
 
(1)Forfeitures on time-based nonvested shares are a result of terminations of employment, while forfeitures on performance-based nonvested shares are a result of failing to attain certain goals as outlined in our executive officers' compensation agreements.
(2)Performance-based shares granted for the year ended December 31, 2019 includes 21,039 shares that were issued as a result of the performance achievement exceeding the performance targets related to grants to our executive officers for the year ended December 31, 2016. These shares vested in March 2019.
Summary of Compensation Expense and Stock Award Activity Below is a summary of compensation expense and stock award activity (in thousands):
 Years Ended December 31,
 201920182017
Stock-based compensation expense$19,607  $17,170  $12,056  
Summary of Additional Information Regarding Stock Plan
The following table includes additional information regarding our Plan (dollars in thousands):
 At December 31,
 20192018
Unrecognized stock-based compensation cost$22,341  $24,954  
Weighted average years expense recognition period1.702.24
Total equity awards outstanding 1,240,529  1,301,745