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Derivative Financial Instruments (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Aug. 14, 2019 | Mar. 07, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Derivative [Line Items] |  |  |  |  |
Unsecured notes |  |  | $ 484,383 | $ 708,734 |
Repayments Of unsecured debt |  |  | 250,000 | 150,000 | $ 0
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax |  |  | (15,585) | 402 | 1,151
Amount reclassified from accumulated other comprehensive loss |  |  | 3,269 | 5,342 | 11,103
Interest Expense |  |  | 151,264 | 148,456 | $ 132,629
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months |  |  | 4,100 |  |
Term Loan Due December 2020 [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Repayments of interest rate swap breakage fee | $ 1,100 |  |  |  |
Repayments Of unsecured debt | $ 300,000 |  |  |  |
Debt Instrument Maturity Period | 2020-12 |  |  |  |
Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Interest Rate Cash Flow Hedge Asset at Fair Value |  |  | 2,987 | 17,482 |
Interest Rate Cash Flow Hedge Liability at Fair Value |  |  | (1,515) | (5,491) |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Interest Rate Cash Flow Hedge Asset at Fair Value |  |  | 2,987 | 17,482 |
Interest Rate Cash Flow Hedge Liability at Fair Value |  |  | (1,515) | (5,491) |
Interest Rate Cash Flow Hedge Derivative At Fair Value Net |  |  | $ 1,472 | 11,991 |
Treasury Lock [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Inception Date |  |  | Dec. 06, 2018 |  |
Derivative, Maturity Date |  |  | Jun. 28, 2019 |  |
Derivative, Notional Amount |  |  | $ 250,000 |  |
Derivative, Description of Variable Rate Basis |  |  | 30 year U.S. Treasury |  |
Derivative, Fixed Interest Rate |  | 4.65% | 3.147% |  |
Interest Rate Cash Flow Hedge Asset at Fair Value |  |  | $ 0 |  |
Interest Rate Cash Flow Hedge Liability at Fair Value |  |  |  | (5,491) |
Unsecured notes |  | $ 300,000 |  |  |
Unsecured notes maturity period |  | 2049-03 |  |  |
Debt Instrument, Term |  | 30 years |  |  |
Treasury Lock [Member] | Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Unsecured notes |  | $ 5,700 |  |  |
Derivative @ 1.824% 300M [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Inception Date |  |  | Apr. 03, 2017 |  |
Derivative, Maturity Date |  |  | Dec. 02, 2020 |  |
Derivative, Notional Amount |  |  | $ 300,000 |  |
Derivative, Description of Variable Rate Basis |  |  | 1 Month LIBOR with Floor |  |
Derivative, Fixed Interest Rate |  |  | 1.824% |  |
Interest Rate Cash Flow Hedge Asset at Fair Value |  |  | $ 0 | 3,759 |
Derivative @ 1.053% 265M [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Inception Date |  |  | Aug. 01, 2016 |  |
Derivative, Maturity Date |  |  | Jan. 05, 2022 |  |
Derivative, Notional Amount |  |  | $ 265,000 |  |
Derivative, Description of Variable Rate Basis |  |  | 1 Month LIBOR with Floor |  |
Derivative, Fixed Interest Rate |  |  | 1.053% |  |
Interest Rate Cash Flow Hedge Asset at Fair Value |  |  | $ 2,674 | 10,838 |
Derivative @ 1.30250% 19.767M [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Inception Date |  |  | Apr. 07, 2016 |  |
Derivative, Maturity Date |  |  | Apr. 01, 2023 |  |
Derivative, Notional Amount |  |  | $ 19,767 |  |
Derivative, Description of Variable Rate Basis |  |  | 1 Month LIBOR |  |
Derivative, Fixed Interest Rate |  |  | 1.303% |  |
Interest Rate Cash Flow Hedge Asset at Fair Value |  |  | $ 148 | 880 |
Derivative @ 1.490% 32.952M [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Inception Date |  |  | Dec. 01, 2016 |  |
Derivative, Maturity Date |  |  | Nov. 01, 2023 |  |
Derivative, Notional Amount |  |  | $ 32,952 |  |
Derivative, Description of Variable Rate Basis |  |  | 1 Month LIBOR |  |
Derivative, Fixed Interest Rate |  |  | 1.49% |  |
Interest Rate Cash Flow Hedge Asset at Fair Value |  |  | $ 84 | 1,376 |
Derivative @ 1.542% 24M [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Inception Date |  |  | Sep. 17, 2019 |  |
Derivative, Maturity Date |  |  | Mar. 17, 2025 |  |
Derivative, Notional Amount |  |  | $ 24,000 |  |
Derivative, Description of Variable Rate Basis |  |  | 1 Month LIBOR |  |
Derivative, Fixed Interest Rate |  |  | 1.542% |  |
Interest Rate Cash Flow Hedge Asset at Fair Value |  |  | $ 81 |  |
Derivative @ 2.366% 37.166M [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Derivative, Inception Date |  |  | Jun. 02, 2017 |  |
Derivative, Maturity Date |  |  | Jun. 02, 2027 |  |
Derivative, Notional Amount |  |  | $ 37,166 |  |
Derivative, Description of Variable Rate Basis |  |  | 1 Month LIBOR with Floor |  |
Derivative, Fixed Interest Rate |  |  | 2.366% |  |
Interest Rate Cash Flow Hedge Asset at Fair Value |  |  |  | $ 629 |
Interest Rate Cash Flow Hedge Liability at Fair Value |  |  | $ (1,515) |  |
Interest Rate Swap [Member] |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months |  |  | $ 4,300 |  |

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