5. Dispositions, Assets Held for Sale and Discontinued Operations
Impairment of assets as reflected in our consolidated statements of comprehensive income relate to properties designated as held for sale and represent the charges necessary to adjust the carrying values to estimated fair values less costs to sell based on current sales price expectations. The following is a summary of our real property disposition activity for the periods presented (in thousands):
| Year Ended | ||||||||||
| December 31, 2013 | December 31, 2012 | December 31, 2011 | ||||||||
| Real property dispositions: | ||||||||||
| Seniors housing triple-net | $ | 189,572 | $ | 372,378 | $ | 150,755 | ||||
| Medical facilities | 259,367 | 149,344 | 35,295 | |||||||
| Total dispositions | 448,939 | 521,722 | 186,050 | |||||||
| Gain (loss) on sales of real property, net | 49,138 | 100,549 | 61,160 | |||||||
| Seller financing on sales of real property | (3,850) | (12,000) | 0 | |||||||
| Non-cash disposition activity | (12,204) | 0 | 0 | |||||||
| Proceeds from real property sales | $ | 482,023 | $ | 610,271 | $ | 247,210 | ||||
We have reclassified the income and expenses attributable to all properties sold prior to or held for sale at December 31, 2013 to discontinued operations. Expenses include an allocation of interest expense based on property carrying values and our weighted-average cost of debt. The following illustrates the reclassification impact as a result of classifying properties as discontinued operations for the periods presented (in thousands):
| Year Ended December 31, | ||||||||||
| 2013 | 2012 | 2011 | ||||||||
| Revenues: | ||||||||||
| Rental income | $ | 18,377 | $ | 96,378 | $ | 124,113 | ||||
| Expenses: | ||||||||||
| Interest expense | 4,246 | 21,735 | 31,018 | |||||||
| Property operating expenses | 3,396 | 4,482 | 8,806 | |||||||
| Provision for depreciation | 8,160 | 27,365 | 37,126 | |||||||
| Income (loss) from discontinued operations, net | $ | 2,575 | $ | 42,796 | $ | 47,163 | ||||