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Consolidated Statements of Equity (Parenthetical) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Statement of Stockholders' Equity [Abstract]      
Cash distribution declared, per common share (usd per share) $ 2.10us-gaap_CommonStockDividendsPerShareDeclared $ 1.49us-gaap_CommonStockDividendsPerShareDeclared $ 1.08us-gaap_CommonStockDividendsPerShareDeclared