Consolidated Statements of Equity (Parenthetical) - shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Stockholders' Equity [Abstract]
Issuance of shares of stock (in shares)	335,417	278,093	246,168
Shares of restricted common stock canceled (in shares)	33,720	47,418	34,039