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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Revenues: |  |  |  |
Rental income | $ 163,997 | $ 155,546 | $ 325,419 | $ 301,329
Residents fees and services | 97,370 | 91,856 | 194,323 | 174,649
Total revenues | 261,367 | 247,402 | 519,742 | 475,978
Expenses: |  |  |  |
Property operating expenses | 97,474 | 93,592 | 195,422 | 179,386
Depreciation and amortization | 71,372 | 62,511 | 142,594 | 116,218
General and administrative | 11,965 | 11,674 | 22,828 | 22,248
Acquisition related costs | 180 | 4,617 | 619 | 5,775
Impairment of assets | 4,961 |  | 12,351 |
Total expenses | 185,952 | 172,394 | 373,814 | 323,627
Operating income (loss) | 75,415 | 75,008 | 145,928 | 152,351
Dividend income | 789 |  | 789 |
Interest and other income | 177 | 142 | 242 | 217
Interest expense | (41,118) | (37,907) | (80,399) | (73,848)
Loss on early extinguishment of debt |  | (39) | (6) | (1,448)
Income from continuing operations before income tax expense and equity in earnings of an investee | 35,263 | 37,204 | 66,554 | 77,272
Income tax expense | (108) | (129) | (202) | (239)
Equity in earnings of an investee | 17 | 23 | 94 | 95
Income (loss) from continuing operations | 35,172 | 37,098 | 66,446 | 77,128
Discontinued operations: |  |  |  |
Loss from discontinued operations |  | (109) |  | (350)
Impairment of assets from discontinued operations |  | (602) |  | (602)
Income before gain on sale of properties | 35,172 | 36,387 | 66,446 | 76,176
Gain on sale of properties | 4,061 |  | 4,061 |
Net income (loss) | 39,233 | 36,387 | 70,507 | 76,176
Other comprehensive income: |  |  |  |
Unrealized gain on investments in available for sale securities | 15,931 | 1,387 | 40,118 | 2,835
Equity in unrealized gain (loss) of an investee | 43 | (64) | 95 | (19)
Other comprehensive income | 15,974 | 1,323 | 40,213 | 2,816
Comprehensive income | $ 55,207 | $ 37,710 | $ 110,720 | $ 78,992
Weighted average common shares outstanding (basic) (in shares) | 237,325 | 235,549 | 237,320 | 228,501
Weighted average common shares outstanding (diluted) (in shares) | 237,363 | 235,592 | 237,349 | 228,534
Per common share amounts (basic and diluted): |  |  |  |
Income from continuing operations (in dollars per share) | $ 0.17 | $ 0.16 | $ 0.30 | $ 0.34
Loss from discontinued operations (in dollars per share) |  | (0.01) |  | (0.01)
Net income (in dollars per share) | $ 0.17 | $ 0.15 | $ 0.30 | $ 0.33

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- Definition Includes all other interest income, net of discount accretion and premium amortization, and dividend income. It may include dividend income from equity securities that do not have readily determinable fair values that are reportable in Other Assets, and interest income on interest-only strips receivable (not in the form of a security) that are included in Other Assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.4) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition The aggregate revenue from real estate operations during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(e)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1505-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Weighted-Average Number of Common Shares Outstanding -URI http://asc.fasb.org/extlink&oid=6528421 + Details
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