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7. Revenue and expense information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Rental and other property revenues $ 20,848 $ 20,402 $ 41,321 $ 40,637
Property operating expenses 10,319 9,416 20,578 19,338
Depreciation 4,481 4,331 8,952 8,080
Mortgage and loan interest 9,746 9,285 18,212 18,720
Deferred borrowing costs amortization 343 (31) 1,282 2,429
Loan charges and prepayment penalties 0 (180) 1,582 4,117
Interest income 6,041 180 10,158 7,053
Gain on land sales (159) 3,512 594 (35)
Segment operating income (loss) 1,841 733 1,467 (5,029)
Capital expenditures 2,120 2,315 3,242 3,304
Real estate assets 671,160 732,153 671,160 732,153
Property Sales        
Sales price 17,317 51,796 40,448 79,346
Cost of sale 10,473 33,722 26,797 54,080
Gain (loss) on sale 6,844 18,074 13,651 25,266
Commercial Properties
        
Rental and other property revenues 4,775 5,121 9,557 10,384
Property operating expenses 3,168 2,383 6,315 5,594
Depreciation 1,758 1,669 3,571 2,777
Mortgage and loan interest 1,637 1,655 3,114 2,986
Deferred borrowing costs amortization 8 21 21 43
Loan charges and prepayment penalties     9   
Interest income            
Gain on land sales            
Segment operating income (loss) (1,796) (607) (3,473) (1,016)
Capital expenditures 1,862 2,236 2,992 2,913
Real estate assets 131,193 138,990 131,193 138,990
Property Sales        
Sales price 16,600 26,974 16,600 26,974
Cost of sale 9,597 14,914 9,597 14,914
Gain (loss) on sale 7,003 12,060 7,003 12,060
Apartments
        
Rental and other property revenues 16,055 15,252 31,736 30,183
Property operating expenses 6,871 6,645 13,668 13,009
Depreciation 2,741 2,701 5,435 5,401
Mortgage and loan interest 4,161 4,336 8,357 9,000
Deferred borrowing costs amortization 104 (94) 992 2,247
Loan charges and prepayment penalties     1,573 3,937
Interest income            
Gain on land sales            
Segment operating income (loss) 2,178 1,664 1,711 (3,411)
Capital expenditures 99 79 99 110
Real estate assets 372,674 383,068 372,674 383,068
Property Sales        
Sales price    24,822 23,131 50,122
Cost of sale    18,808 17,077 36,881
Gain (loss) on sale    6,014 6,054 13,241
Hotels
        
Rental and other property revenues            
Property operating expenses            
Depreciation            
Mortgage and loan interest            
Deferred borrowing costs amortization            
Loan charges and prepayment penalties          
Interest income            
Gain on land sales            
Segment operating income (loss)            
Capital expenditures            
Real estate assets            
Property Sales        
Sales price            
Cost of sale            
Gain (loss) on sale            
Land
        
Rental and other property revenues    22    56
Property operating expenses 280 356 590 726
Depreciation       (54)   
Mortgage and loan interest 1,412 1,504 2,462 3,041
Deferred borrowing costs amortization 46 35 81 97
Loan charges and prepayment penalties          
Interest income            
Gain on land sales (159)    594 (35)
Segment operating income (loss) (1,897) (1,873) (2,485) (3,843)
Capital expenditures 159    151 281
Real estate assets 167,293 210,095 167,293 210,095
Property Sales        
Sales price 717    717 2,250
Cost of sale 876    123 2,285
Gain (loss) on sale (159)    594 (35)
Other
        
Rental and other property revenues 18 7 28 14
Property operating expenses    32 5 9
Depreciation (18) (39)    (98)
Mortgage and loan interest 2,536 1,790 4,279 3,693
Deferred borrowing costs amortization 185 7 188 42
Loan charges and prepayment penalties        180
Interest income 6,041 180 10,158 7,053
Gain on land sales    3,512      
Segment operating income (loss) 3,356 1,549 5,714 3,241
Capital expenditures            
Real estate assets            
Property Sales        
Sales price            
Cost of sale            
Gain (loss) on sale