CONSOLIDATED STATEMENTS OF EQUITY (Parenthetical) - shares	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
CONSOLIDATED STATEMENTS OF EQUITY
Issuance of restricted share awards under long-term equity incentive plan (in shares)	158,900
Repurchase of shares of common stock pursuant to Share Repurchase Program (in shares)	858,393	341,500
Repurchase of shares of common stock pursuant to Accelerated Share Repurchase Program (in shares)	1,507,443
Number of shares of common stock withheld to satisfy statutory withholding requirements (in shares)	113,087	61,906