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Selected Quarterly Financial Data (Unaudited) (Details) $ / shares in Units, $ in Thousands, £ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
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Dec. 31, 2018 USD ($) | Nov. 30, 2018 USD ($) joint_venture | Apr. 30, 2018 property | Jan. 31, 2018 property | Mar. 31, 2017 USD ($) facility | Dec. 31, 2018 USD ($) property facility joint_venture $ / shares | Sep. 30, 2018 USD ($) facility $ / shares | Jun. 30, 2018 USD ($) facility $ / shares | Mar. 31, 2018 USD ($) facility $ / shares | Mar. 31, 2018 GBP (£) facility | Dec. 31, 2017 USD ($) $ / shares | Sep. 30, 2017 USD ($) $ / shares | Jun. 30, 2017 USD ($) $ / shares | Mar. 31, 2017 USD ($) facility $ / shares | Mar. 31, 2017 GBP (£) facility | Dec. 31, 2018 USD ($) property $ / shares | Dec. 31, 2017 USD ($) property facility $ / shares | Dec. 31, 2016 USD ($) facility $ / shares
Total revenues |  |  |  |  |  | $ 441,919 | $ 456,022 | $ 469,551 | $ 479,197 |  | $ 443,259 | $ 454,023 | $ 458,928 | $ 492,168 |  | $ 1,846,689 | $ 1,848,378 | $ 2,129,294
Income (loss) before income taxes and equity income from investments in unconsolidated joint ventures |  |  |  |  |  | 833,600 | 98,908 | 88,375 | 37,331 |  | (50,957) | (12,263) | 18,874 | 454,746 |  | 1,058,214 | 410,400 | 367,284
Net income (loss) |  |  |  |  |  | 834,383 | 102,926 | 92,928 | 43,237 |  | (57,924) | (5,720) | 22,101 | 464,177 |  | 1,073,474 | 422,634 | 639,926
Net income (loss) applicable to HCP, Inc. |  |  |  |  |  | $ 831,548 | $ 99,371 | $ 89,942 | $ 40,232 |  | $ (58,702) | $ (7,657) | $ 19,383 | $ 461,145 |  | $ 1,061,093 | $ 414,169 | $ 627,747
Dividends paid per common share (in dollars per share) | $ / shares |  |  |  |  |  | $ 0.37 | $ 0.37 | $ 0.37 | $ 0.37 |  | $ 0.37 | $ 0.37 | $ 0.37 | $ 0.37 |  |  |  |
Basic earnings per common share (in dollars per share) | $ / shares |  |  |  |  |  | 1.75 | 0.21 | 0.19 | 0.08 |  | (0.13) | (0.02) | 0.04 | 0.98 |  | $ 2.25 | $ 0.88 | $ 1.34
Diluted earnings per common share (in dollars per share) | $ / shares |  |  |  |  |  | $ 1.73 | $ 0.21 | $ 0.19 | $ 0.08 |  | $ (0.13) | $ (0.02) | $ 0.04 | $ 0.97 |  | $ 2.24 | $ 0.88 | $ 1.34
Proceeds from sale of buildings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 335,709 | $ 462,242 | $ 0
Gain on consolidation |  |  |  |  |  | $ 50,000 |  |  |  |  |  |  |  |  |  | 9,154 | 0 | 0
Impairments (recoveries), net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 55,260 | 166,384 | 0
Loss on extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 44,162 | 54,227 | 46,020
Operating expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 705,038 | 666,251 | 738,399
Tax expense recorded from Tax Cuts and Jobs Act |  |  |  |  |  |  |  |  |  |  | $ 17,000 |  |  |  |  |  |  |
Gain (loss) on sales of real estate, net |  |  |  |  |  |  | $ 95,000 | $ 25,000 |  |  |  |  |  |  |  | 925,985 | $ 356,641 | $ 164,698
Payments to acquire real estate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 21,000 |  |
RIDEA II |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sales of real estate, net |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 99,000 |  |  |  |
Four Seasons |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire loans receivable |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 51,000 | £ 42 |  |  |
Tandem Health Care Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Write down of loans receivable |  |  |  |  |  |  |  |  |  |  | 84,000 | $ 3,000 | $ 57,000 |  |  | 144,000 |  |
Senior Unsecured Debt 5.625% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of senior unsecured notes |  |  |  |  |  |  |  |  |  |  |  |  | $ 250,000 |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  | 5.625% |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  | 54,000 |  |  |  |  |  |
Senior Unsecured Debt 5.375% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of senior unsecured notes |  |  |  |  |  |  | $ 700,000 |  |  |  |  | $ 500,000 |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  | 5.375% |  |  |  |  | 5.375% |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  |  | $ 44,000 |  |  |  |  |  |  |  |  |  |  |
Senior Housing Triple-Net and SHOP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of assets |  |  |  |  |  | $ 40,000 |  |  |  |  |  |  |  |  |  |  |  |
Senior Housing Triple-Net and SHOP | Held-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties disposed (in facilities) | facility |  |  |  |  |  | 19 |  |  |  |  |  |  |  |  |  |  |  |
Senior housing triple-net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties disposed (in facilities) | facility |  |  |  |  | 64 |  |  | 2 |  |  |  |  |  |  |  |  | 4 | 7
Impairments (recoveries), net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 23,000 |
Number of real estate properties impaired (in properties) | property |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11 |
Gain (loss) on sales of real estate, net |  |  |  |  | $ 170,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Senior housing triple-net | Held-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties disposed (in facilities) | facility |  |  |  |  |  | 11 |  |  |  |  |  |  |  | 64 | 64 |  |  |
Gain (loss) on sales of real estate, net |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 170,000 |  |  |  |
SHOP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties disposed (in facilities) | facility |  |  |  |  |  | 2 | 11 | 8 | 2 | 2 |  |  |  |  |  |  | 5 | 3
Impairments (recoveries), net |  |  |  |  |  | $ 33,000 |  |  |  |  |  |  |  |  |  | $ 52,000 |  |
Number of real estate properties impaired (in properties) | property |  |  |  |  |  | 4 |  |  |  |  |  |  |  |  |  | 17 |  |
Gain (loss) on sales of real estate, net |  |  |  |  |  |  |  |  | $ 21,000 |  |  |  |  |  |  |  |  |
SHOP | Held-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties disposed (in facilities) | facility |  |  |  |  |  | 8 |  |  |  |  |  |  |  |  |  |  |  |
Assets Leased to Others |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties disposed (in facilities) | property |  |  |  |  |  | 19 |  |  |  |  |  |  |  |  |  |  |  |
Assets Leased to Others | Senior housing triple-net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties disposed (in facilities) | property |  |  |  |  |  | 11 |  |  |  |  |  |  |  |  |  |  |  |
Reduction in rental and related revenues |  |  |  |  |  |  |  |  |  |  | 20,000 |  |  |  |  |  |  |
Real estate | Assets Under Management Agreements | SHOP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating expenses |  |  |  |  |  |  |  |  |  |  | $ 35,000 |  |  |  |  |  |  |
Shoreline Technology Center |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of assets |  | $ 726,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
RIDEA Facilities | Assets Leased to Others |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  |  |  |  |  | $ 377,000 |  |  |  |  |  |  |  |  |  |  |  |
RIDEA Facilities | Assets Leased to Others | Senior Housing Triple-Net and SHOP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of buildings |  |  |  |  |  | $ 377,000 |  |  |  |  |  |  |  |  |  |  |  |
RIDEA Facilities | Assets Leased to Others | SHOP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of properties disposed (in facilities) | property |  |  | 3 | 1 |  | 8 |  |  |  |  |  |  |  |  |  |  |  |
Life Science JVs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of joint ventures | joint_venture |  | 3 |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire real estate | $ 245,000 |  |  |  |  | $ 92,000 |  |  |  |  |  |  |  |  |  |  |  |
MMCG |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on consolidation |  |  |  |  |  |  |  |  | (41,000) | £ (29) |  |  |  |  |  |  |  |
MMCG | Bridge Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on consolidation |  |  |  |  |  |  |  |  | $ (41,000) | £ (29) |  |  |  |  |  |  |  |

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