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Consolidated Statements of Equity (Parenthetical) - shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Statement of Stockholders' Equity [Abstract]      
Issuance of shares of stock (in shares) 278,093 246,168 8,772,114
Shares of restricted common stock canceled (in shares) 47,418 34,039 41,661