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CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Revenues: |  |  |  |
Rental income | $ 33,753 | $ 28,531 | $ 98,705 | $ 82,325
Interest income from mortgage loans | 6,958 | 6,117 | 20,347 | 15,777
Interest and other income | 131 | 295 | 390 | 708
Total revenues | 40,842 | 34,943 | 119,442 | 98,810
Expenses: |  |  |  |
Interest expense | 6,836 | 4,296 | 19,586 | 11,916
Depreciation and amortization | 9,155 | 7,365 | 26,623 | 21,121
Provision for doubtful accounts | 43 | 31 | 245 | 463
Acquisition costs | 2 | 570 | 96 | 632
General and administrative expenses | 4,464 | 3,708 | 12,864 | 11,094
Total expenses | 20,500 | 15,970 | 59,414 | 45,226
Operating income | 20,342 | 18,973 | 60,028 | 53,584
Income from unconsolidated joint ventures | 289 | 674 | 839 | 1,543
Gain on sale of real estate, net | 1,780 |  | 3,582 |
Net income | 22,411 | 19,647 | 64,449 | 55,127
Income allocated to participating securities | (90) | (121) | (296) | (370)
Income allocated to preferred stockholders |  | (818) |  | (2,454)
Net income available to common stockholders | $ 22,321 | $ 18,708 | $ 64,153 | $ 52,303
Earnings per common share |  |  |  |
Basic (in dollars per share) | $ 0.57 | $ 0.53 | $ 1.68 | $ 1.48
Diluted (in dollars per share) | $ 0.57 | $ 0.52 | $ 1.68 | $ 1.47
Weighted average shares used to calculate earnings per common share |  |  |  |
Basic (in shares) | 39,057 | 35,341 | 38,161 | 35,306
Diluted (in shares) | 39,335 | 37,352 | 38,455 | 37,319
Dividends per share declared (in dollars per share) | $ 0.54 | $ 0.51 | $ 1.62 | $ 1.53
Dividends paid per common share (in dollars per share) | $ 0.54 | $ 0.51 | $ 1.62 | $ 1.53

X
- 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=34752592&loc=d3e1043-128460 + Details
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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Aggregate dividends declared during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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- Definition Total costs of sales and operating expenses for the 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) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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- Definition The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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