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Discontinued Operations and Assets Held for Sale (Discontinued Operations) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Discontinued Operations and Disposal Groups [Abstract]        
Revenues   $ 123   $ 637
Operating expenses   (82)   (1,571)
Other expense, net   0   5,815
Income from discontinued operating properties $ 0 41 $ 0 4,881
Gain on disposition of operating properties 0 0 0 14,426
Income from discontinued operations $ 0 $ 41 $ 0 $ 19,307