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