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Earnings Per Share (Narrative) (Details) - shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Earnings Per Share [Abstract]      
Weighted average nonvested restricted shares outstanding 3,500,000 3,700,000 3,800,000
Weighted average number of OP units outstanding 378,000 433,000 297,000