Quarterly report pursuant to Section 13 or 15(d)

CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical)

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CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) - shares
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
CONSOLIDATED STATEMENTS OF EQUITY    
Issuance of restricted share awards under long-term equity incentive plan (in shares) 89,530 143,800
Repurchase of shares of common stock pursuant to Share Repurchase Program (in shares)   858,393
Repurchase of shares of common stock pursuant to Accelerated Share Repurchase Program (in shares) 13,657  
Number of shares of common stock withheld to satisfy statutory withholding requirements (in shares) 83,982 59,940