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Derivatives (Details) - USD ($) $ in Thousands |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 14, 2019 | Mar. 07, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Derivative [Line Items] |  |  |  |  |  |  |
Unsecured notes |  |  | $ 449,309 |  | $ 449,309 |  | $ 708,734
Repayments of Unsecured Debt |  |  |  |  | 250,000 | $ 150,000 |
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax |  |  | (3,851) | $ 2,717 | (18,567) | 16,511 |
Amount reclassified from accumulated other comprehensive loss |  |  | 1,677 | 1,148 | 2,085 | 4,701 |
Interest Expense |  |  | 38,253 | $ 36,618 | 113,178 | $ 111,477 |
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months |  |  |  |  | 5,500 |  |
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 |  |  | 2,642 |  | 2,642 |  | 17,482
Interest Rate Cash Flow Hedge Liability at Fair Value |  |  | (2,494) |  | (2,494) |  | (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 |  |  | 2,642 |  | 2,642 |  | 17,482
Interest Rate Cash Flow Hedge Liability at Fair Value |  |  | (2,494) |  | (2,494) |  | (5,491)
Interest Rate Cash Flow Hedge Derivative At Fair Value Net |  |  | 148 |  | $ 148 |  | 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 |  | $ 250,000 |  |
Derivative, Description of Variable Rate Basis |  |  |  |  | 30 year U.S. Treasury |  |
Derivative, Fixed Interest Rate |  | 4.65% | 3.147% |  | 3.147% |  |
Interest Rate Cash Flow Hedge Asset at Fair Value |  |  | $ 0 |  | $ 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 $300M Term [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, Inception Date |  |  |  |  | Apr. 03, 2017 |  |
Derivative, Maturity Date |  |  |  |  | Dec. 02, 2020 |  |
Derivative, Notional Amount |  |  | $ 300,000 |  | $ 300,000 |  |
Derivative, Description of Variable Rate Basis |  |  |  |  | 1 Month LIBOR with Floor |  |
Derivative, Fixed Interest Rate |  |  | 1.824% |  | 1.824% |  |
Interest Rate Cash Flow Hedge Asset at Fair Value |  |  |  |  |  |  | 3,759
Derivatives 200K @ 1.04770% and 65K @ 1.07000% [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, Inception Date |  |  |  |  | Aug. 01, 2016 |  |
Derivative, Maturity Date |  |  |  |  | Jan. 05, 2022 |  |
Derivative, Notional Amount |  |  | $ 265,000 |  | $ 265,000 |  |
Derivative, Description of Variable Rate Basis |  |  |  |  | 1 Month LIBOR with Floor |  |
Derivative, Fixed Interest Rate |  |  | 1.053% |  | 1.053% |  |
Interest Rate Cash Flow Hedge Asset at Fair Value |  |  | $ 2,581 |  | $ 2,581 |  | 10,838
Derivative @ 1.30250% 20.0M [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, Inception Date |  |  |  |  | Apr. 07, 2016 |  |
Derivative, Maturity Date |  |  |  |  | Apr. 01, 2023 |  |
Derivative, Notional Amount |  |  | $ 19,855 |  | $ 19,855 |  |
Derivative, Description of Variable Rate Basis |  |  |  |  | 1 Month LIBOR |  |
Derivative, Fixed Interest Rate |  |  | 1.303% |  | 1.303% |  |
Interest Rate Cash Flow Hedge Asset at Fair Value |  |  | $ 61 |  | $ 61 |  | 880
Derivative $33M Swap [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, Inception Date |  |  |  |  | Dec. 01, 2016 |  |
Derivative, Maturity Date |  |  |  |  | Nov. 01, 2023 |  |
Derivative, Notional Amount |  |  | $ 33,000 |  | $ 33,000 |  |
Derivative, Description of Variable Rate Basis |  |  |  |  | 1 Month LIBOR |  |
Derivative, Fixed Interest Rate |  |  | 1.49% |  | 1.49% |  |
Interest Rate Cash Flow Hedge Asset at Fair Value |  |  |  |  |  |  | 1,376
Interest Rate Cash Flow Hedge Liability at Fair Value |  |  | $ (137) |  | $ (137) |  |
Derivative $24M Swap [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, Inception Date |  |  |  |  | Sep. 17, 2019 |  |
Derivative, Maturity Date |  |  |  |  | Mar. 17, 2025 |  |
Derivative, Notional Amount |  |  | $ 24,000 |  | $ 24,000 |  |
Derivative, Description of Variable Rate Basis |  |  |  |  | 1 Month LIBOR |  |
Derivative, Fixed Interest Rate |  |  | 1.542% |  | 1.542% |  |
Interest Rate Cash Flow Hedge Liability at Fair Value |  |  | $ (206) |  | $ (206) |  |
Derivative @ 2.36600% 37.5K [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Derivative, Inception Date |  |  |  |  | Jun. 02, 2017 |  |
Derivative, Maturity Date |  |  |  |  | Jun. 02, 2027 |  |
Derivative, Notional Amount |  |  | $ 37,309 |  | $ 37,309 |  |
Derivative, Description of Variable Rate Basis |  |  |  |  | 1 Month LIBOR with Floor |  |
Derivative, Fixed Interest Rate |  |  | 2.366% |  | 2.366% |  |
Interest Rate Cash Flow Hedge Asset at Fair Value |  |  |  |  |  |  | $ 629
Interest Rate Cash Flow Hedge Liability at Fair Value |  |  | $ (2,151) |  | $ (2,151) |  |
Swap [Member] |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months |  |  |  |  | $ 5,900 |  |

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