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Derivatives (Narrative) (Details) | 3 Months Ended | 6 Months Ended |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2019 USD ($) instrument | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | 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 | $ (4,222,451,000) | $ (3,989,111,000) | $ (4,222,451,000) | $ (3,989,111,000) | $ (4,152,887,000) | $ (4,154,605,000) |  | $ (3,864,506,000) | $ (3,840,910,000) |  |  |  |  |
Interest expense | 29,811,000 | $ 27,110,000 | 59,768,000 | 53,712,000 |  |  |  |  |  |  |  |  |  |
Interest rate cash flow hedge gain (loss) to be reclassified over next 12 months, net | (1,333,000) |  | (1,333,000) |  |  |  |  |  |  |  |  |  |  |
Fair value in other liabilities and accumulated other comprehensive income (loss) | $ 3,920,000 |  | 3,920,000 |  |  |  |  |  |  |  |  |  |  |
Forward Swap |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of derivatives entered | instrument | 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount | $ 90,000,000 |  | 90,000,000 |  |  |  | $ 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 |  |  | $ (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 |  |  | 648,000 | $ 1,056,000 |  |  |  |  |  |  |  |  |  |
AOCI, cash flow hedges |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stockholders' equity | $ 6,263,000 |  | $ 6,263,000 |  |  |  |  |  |  |  |  |  |  |

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