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Discontinued Operations - Summary of Revenue and Expense Information for Properties Sold which Qualify for Discontinued Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Revenue: |  |  |  |  |  |  |  |  |  |  |
Rents |  |  |  |  |  |  |  |  | $ 486,731 | $ 483,682 | $ 461,387
Tenant reimbursements |  |  |  |  |  |  |  |  | 85,722 | 84,879 | 79,087
Other |  |  |  |  |  |  |  |  | 6,617 | 3,221 | 4,186
Total revenue | $ 153,992 | $ 152,585 | $ 145,648 | $ 150,406 | $ 147,810 | $ 146,558 | $ 150,500 | $ 152,114 | 602,631 | 596,982 | 562,210
Expenses: |  |  |  |  |  |  |  |  |  |  |
Property operating expenses |  |  |  |  |  |  |  |  | 181,170 | 177,330 | 160,406
Real estate taxes |  |  |  |  |  |  |  |  | 50,623 | 51,844 | 55,612
Depreciation and amortization |  |  |  |  |  |  |  |  | 219,029 | 208,569 | 197,021
Total operating expenses |  |  |  |  |  |  |  |  | 568,730 | 473,078 | 446,418
Interest income |  |  |  |  |  |  |  |  | 1,224 | 3,974 | 1,044
Income from discontinued operations before gain on sale of interests in real estate |  |  |  |  |  |  |  |  | 0 | 18 | 825
Net gain on disposition of discontinued operations |  |  |  |  |  |  |  |  | 0 | 900 | 3,382
Total discontinued operations |  |  |  |  |  |  |  |  | $ 0 | 918 | 4,207
Discontinued Operations [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |
Rents |  |  |  |  |  |  |  |  |  | 0 | 4,754
Tenant reimbursements |  |  |  |  |  |  |  |  |  | 26 | 355
Other |  |  |  |  |  |  |  |  |  | 0 | 123
Total revenue |  |  |  |  |  |  |  |  |  | 26 | 5,232
Expenses: |  |  |  |  |  |  |  |  |  |  |
Property operating expenses |  |  |  |  |  |  |  |  |  | 8 | 1,839
Real estate taxes |  |  |  |  |  |  |  |  |  | 0 | 649
Depreciation and amortization |  |  |  |  |  |  |  |  |  | 0 | 1,921
Total operating expenses |  |  |  |  |  |  |  |  |  | 8 | 4,409
Interest income |  |  |  |  |  |  |  |  |  | 0 | 2
Income from discontinued operations before gain on sale of interests in real estate |  |  |  |  |  |  |  |  |  | 18 | 825
Net gain on disposition of discontinued operations |  |  |  |  |  |  |  |  |  | 900 | 3,382
Total discontinued operations |  |  |  |  |  |  |  |  |  | $ 918 | $ 4,207

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- Definition Amount after tax of income (loss) from a discontinued operation including the portion attributable to the noncontrolling interest. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.12) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 5C -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=51717284&loc=SL51721675-107760 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.14) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=51716988&loc=d3e1012-107759 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3B -URI http://asc.fasb.org/extlink&oid=51716988&loc=SL51721525-107759 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3A -URI http://asc.fasb.org/extlink&oid=51716988&loc=SL51721523-107759 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=51716988&loc=d3e957-107759 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51717284&loc=d3e1361-107760 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Article 7 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Article 5 + Details
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