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Derivative Financial Instruments (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Derivative [Line Items] |  |  |  |  |  |
Unrealized loss on forward starting swaps/Interest rate swaps | $ (6,732,000) |  | $ 2,187,000 | $ (9,282,000) | $ 10,926,000 |
Expected net decrease to interest expense | (300,000) |  |  | (300,000) |  |
Derivatives designated as cash flow hedges in prepaid expenses and other assets: |  |  |  |  |  |
Interest rate swaps | 0 |  |  | 0 |  | $ 1,146,000
Derivatives designated as cash flow hedges in accounts payable, accrued expenses and other liabilities: |  |  |  |  |  |
Interest rate swaps | 284,000 |  |  | 284,000 |  | 3,581,000
Amount of unrealized gains/(losses) recognized in accumulated other comprehensive income/(loss) on derivatives: |  |  |  |  |  |
Unrealized loss on forward starting swaps/Interest rate swaps | (6,732,000) |  | 2,187,000 | (9,282,000) | 10,926,000 |
Amount of gains reclassified out of accumulated other comprehensive income/(loss) into interest expense: |  |  |  |  |  |
Interest rate swaps | (283,000) |  | $ (654,000) | (1,158,000) | $ (1,275,000) |
4.20% (4.234% effective rate) Notes due 2029 [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Principal debt amount |  | $ 350,000,000.0 |  |  |  |
Interest rate (in hundredths) |  | 4.20% |  |  |  |
Scheduled maturity date |  | Apr. 15, 2029 |  |  |  |
3.050% (3.079% effective rate) Notes due 2030 [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Principal debt amount | $ 400,000,000.0 |  |  | $ 400,000,000.0 |  |
Interest rate (in hundredths) | 3.05% |  |  | 3.05% |  |
Scheduled maturity date | Feb. 15, 2030 |  |  |  |  |
Forward Starting Swaps [Member] |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative, Notional Amount | $ 150,000,000.0 |  |  | $ 150,000,000.0 |  | $ 225,000,000.0
Underlying treasury rate term (in periods) | 10 years |  |  |  |  | 10 years
Underlying treasury rate locked by forward-starting swaps (in hundredths) | 1.87% |  |  | 1.87% |  | 2.86%
Unrealized loss on forward starting swaps/Interest rate swaps | $ (6,600,000) | $ (5,100,000) |  |  |  |
Amount of unrealized gains/(losses) recognized in accumulated other comprehensive income/(loss) on derivatives: |  |  |  |  |  |
Unrealized loss on forward starting swaps/Interest rate swaps | $ (6,600,000) | $ (5,100,000) |  |  |  |

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