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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 |  |  |  |

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