Quarterly report pursuant to Section 13 or 15(d)

CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical)

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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) - $ / shares
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY    
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Issuance of restricted share awards under long-term equity incentive plan (in shares) 30,284 63,780
Repurchase of shares pursuant to the settlement of ASR Agreement (in shares)   73,455
Repurchase of shares pursuant to the Repurchase Program(in shares) 49,284 (188,100)
Number of shares withheld to pay taxes on employees' equity awards (in shares) 43,290 97,144
Shares issued upon exercise of stock options (in shares) 51,915