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Derivative Financial Instruments (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Expected increase/(decrease) to interest expense |  |  | $ 500 |  |  |
Derivatives designated as cash flow hedges in accounts payable, accrued expenses and other liabilities [Abstract] |  |  |  |  |  |
Interest rate swaps |  |  | 846 | $ 154 |  |
Amount of unrealized gains/(losses) recognized in accumulated other comprehensive income/(loss) on derivatives (effective portion) [Abstract] |  |  |  |  |  |
Interest rate swaps/Unrealized gain/(loss) reclassified to interest expense |  |  | (1,238) | (9,134) | $ 4,161 |
Amount of (gains)/losses reclassified out of accumulated other comprehensive income/(loss) into interest expense (effective portion) [Abstract] |  |  |  |  |  |
Interest rate swaps |  |  | $ 247 | (1,250) | (2,086) |
3.050% (3.079% effective rate) Notes due 2030 [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Principal amount of debt |  |  |  | $ 400,000 |  |
Stated interest rate (in hundredths) |  |  |  | 3.05% |  |
4.20% (4.234% effective rate) Notes due 2029 [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Principal amount of debt |  |  |  | $ 350,000 |  |
Stated interest rate (in hundredths) |  |  |  | 4.20% |  |
4.125% (4.271% effective rate) Notes due 2028 [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Principal amount of debt |  |  |  |  | $ 350,000 |
Stated interest rate (in hundredths) |  |  |  |  | 4.125% |
Forward Starting Swaps [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Amount of borrowings outstanding, subject to swaps |  |  |  | $ 150,000 | $ 225,000 | $ 150,000
Underlying treasury rate term (in years) |  |  |  | 10 years | 10 years | 10 years
Weighted average interest rate under derivative instruments (in hundredths) |  |  |  | 1.87% | 2.86% | 2.44%
Gain on hedge ineffectiveness in interest expense |  |  |  |  | $ 200 |
Amount of unrealized gains/(losses) recognized in accumulated other comprehensive income/(loss) on derivatives (effective portion) [Abstract] |  |  |  |  |  |
Interest rate swaps/Unrealized gain/(loss) reclassified to interest expense | $ (6,600) | $ (5,100) |  |  | $ 7,000 |
Floating to Fixed Interest Rate Swaps (2017) [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Amount of borrowings outstanding, subject to swaps |  |  |  |  |  | $ 50,000
Underlying treasury rate term (in years) |  |  |  |  |  | 1 month
Weighted average interest rate under derivative instruments (in hundredths) |  |  |  |  |  | 1.693%
Floating to Fixed Interest Rate Swaps [Member] |  |  |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |  |  |
Amount of borrowings outstanding, subject to swaps |  |  |  | $ 225,000 |  |
Underlying treasury rate term (in years) |  |  |  | 1 month |  |
Weighted average interest rate under derivative instruments (in hundredths) |  |  |  | 1.678% |  |

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