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Derivatives (Narrative) (Details) | 3 Months Ended | 9 Months Ended |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) instrument | Sep. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2016 USD ($) | Oct. 31, 2015 USD ($) | May 31, 2014 USD ($) | Apr. 30, 2013 USD ($)
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity | $ (4,626,504,000) | $ (4,077,220,000) | $ (4,626,504,000) | $ (4,077,220,000) | $ (4,222,451,000) | $ (4,154,605,000) | $ (3,989,111,000) | $ (3,840,910,000) |  |  |  |  |
Interest expense | 29,948,000 | 27,194,000 | 89,716,000 | 80,906,000 |  |  |  |  |  |  |  |  |
Interest rate cash flow hedge gain (loss) to be reclassified over next 12 months, net | (1,349,000) |  | (1,349,000) |  |  |  |  |  |  |  |  |  |
Fair value in other liabilities and accumulated other comprehensive income (loss) | 11,738,000 |  | $ 11,738,000 |  |  |  |  |  |  |  |  |  |
Forward Swap |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Number of derivatives entered | instrument |  |  | 3 |  |  |  |  |  |  |  |  |  |
Notional amount | 200,000,000 | 250,000,000 | $ 200,000,000 | 250,000,000 |  |  |  |  | $ 250,000,000 | $ 180,000,000 | $ 300,000,000 | $ 225,000,000 | $ 240,000,000
Fair value in other liabilities and accumulated other comprehensive income (loss) |  | $ 4,080,000 |  | 4,080,000 |  |  |  |  | $ (7,688,000) | $ 13,345,000 | $ (13,369,000) | $ (6,312,000) | $ (3,141,000)
Reclassification out of other comprehensive income |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  | 975,000 | $ 1,581,000 |  |  |  |  |  |  |  |  |
AOCI, cash flow hedges |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity | $ 5,936,000 |  | $ 5,936,000 |  |  |  |  |  |  |  |  |  |

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