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Consolidated Statements Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Revenue |  |  |
Real estate rental revenue | $ 304,983 | $ 284,156 | $ 253,127
Expenses |  |  |
Utilities | 19,421 | 19,397 | 17,608
Real estate taxes | 31,516 | 26,855 | 24,644
Repairs and maintenance | 14,198 | 13,231 | 11,685
Property administration | 10,433 | 9,528 | 8,527
Property management | 10,130 | 8,773 | 7,158
Operating services and common area maintenance | 14,971 | 14,502 | 13,236
Other real estate expenses | 2,607 | 3,056 | 1,887
Depreciation and amortization | 103,067 | 91,805 | 78,483
Acquisition costs | 234 | 3,607 | 1,161
Real estate impairment | 2,097 | 14,526 | 0
General and administrative | 15,488 | 15,728 | 14,406
Total expenses | 224,162 | 221,008 | 178,795
Real estate operating income | 80,821 | 63,148 | 74,332
Other income (expense) |  |  |
Interest expense | (64,697) | (66,214) | (66,965)
Other income | 975 | 1,144 | 1,193
Gain from non-disposal activities | 0 | 0 | 7
Loss on extinguishment of debt | 0 | (976) | (9,176)
Total other income (expense) | (63,722) | (66,046) | (74,941)
Income (loss) from continuing operations | 17,099 | (2,898) | (609)
Discontinued operations: |  |  |
Income from operations of properties sold or held for sale | 1,485 | 11,923 | 16,569
Gain on sale of real estate | 5,124 | 97,491 | 21,599
Income tax expense | 0 | (1,138) | 0
Net income | 23,708 | 105,378 | 37,559
Less: Net income attributable to noncontrolling interests in subsidiaries | 0 | (494) | (133)
Net income attributable to the controlling interests | $ 23,708 | $ 104,884 | $ 37,426
Basic net income (loss) attributable to the controlling interests per share |  |  |
Continuing operations - basic (in dollars per share) | $ 0.25 | $ (0.04) | $ (0.01)
Discontinued operations, including gain on sale of real estate (in dollars per share) | $ 0.10 | $ 1.62 | $ 0.61
Net income attributable to the controlling interests per share, basic | $ 0.35 | $ 1.58 | $ 0.60
Diluted net income (loss) attributable to the controlling interests per share |  |  |
Continuing operations - diluted (in dollars per share) | $ 0.25 | $ (0.04) | $ (0.01)
Discontinued operations, including gain on sale of real estate (in dollars per share) | $ 0.10 | $ 1.62 | $ 0.61
Net income attributable to the controlling interests per share, diluted | $ 0.35 | $ 1.58 | $ 0.60
Weighted average shares outstanding – basic | 66,239 | 65,982 | 62,140
Weighted average shares outstanding – diluted | 66,376 | 65,982 | 62,140
Dividends declared and paid per share | $ 1.4675 | $ 1.735 | $ 1.73125

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=21917927&loc=d3e1043-128460 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141R -Paragraph 59 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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