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Derivative Instruments (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Nov. 22, 2019 | Dec. 31, 2018
Derivative Instruments |  |  |
Derivative Asset | $ 10,848,000 |  | $ 13,923,000
Derivative Liability | 36,087,000 |  | 10,966,000
Cash Collateral for Interest Rate Swap Contracts | 12,200,000 |  |
Total Notional Amount Forward Starting Interest Rate Swap | $ 550,000,000.0 |  |
Interest Rate Swap [Member] |  |  |
Derivative Instruments |  |  |
Net Notional Amount of Interest Rate During Period | 2.02% |  |
Interest Rate Swaps Average Remaining Maturity | 5 years 1 month 6 days |  |
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] |  |  |
Derivative Instruments |  |  |
Derivative Asset | $ 10,562,000 |  | 10,531,000
Derivative Liability | 36,087,000 |  | 10,966,000
Net Notional Amount of Interest Rate Agreements | 1,799,204,000 |  |
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member] |  |  |
Derivative Instruments |  |  |
Derivative Asset | 286,000 |  | 3,392,000
Derivative Liability | 0 |  | $ 0
Interest Rate Swap, One [Member] |  |  |
Derivative Instruments |  |  |
Derivative, Funds Received |  | $ 3,900,000 |
Derivative, Notional Amount |  | 100,000,000.0 |
Interest Rate Swap, Two [Member] |  |  |
Derivative Instruments |  |  |
Derivative, Funds Received |  | 3,900,000 |
Derivative, Notional Amount |  | 100,000,000.0 |
Interest Rate Swap, Three [Member] |  |  |
Derivative Instruments |  |  |
Derivative, Funds Received |  | 14,500,000 |
Derivative, Notional Amount |  | $ 190,000,000.0 |
Interest Rate Swap, 1.84% Maturing on June 20, 2026 [Member] | Designated as Hedging Instrument [Member] |  |  |
Derivative Instruments |  |  |
Net Notional Amount of Interest Rate Agreements | $ 75,000,000.0 |  |
Derivative, Fixed Interest Rate | 1.84% |  |
Interest Rate Swap, 1.83% Maturing on June 20, 2026 [Member] | Designated as Hedging Instrument [Member] |  |  |
Derivative Instruments |  |  |
Net Notional Amount of Interest Rate Agreements | $ 75,000,000.0 |  |
Derivative, Fixed Interest Rate | 1.83% |  |
Interest Rate Swap, 1.57% Maturing on November, 30,2029 [Member] | Designated as Hedging Instrument [Member] |  |  |
Derivative Instruments |  |  |
Net Notional Amount of Interest Rate Agreements | $ 200,000,000.0 |  |
Derivative, Fixed Interest Rate | 1.57% |  |
Interest Rate Swap, 1.55% Maturing on November, 30,2029 [Member] | Designated as Hedging Instrument [Member] |  |  |
Derivative Instruments |  |  |
Net Notional Amount of Interest Rate Agreements | $ 100,000,000.0 |  |
Derivative, Fixed Interest Rate | 1.55% |  |
Interest Rate Swap, 1.57% Maturing on November, 30,2029 [Member] | Designated as Hedging Instrument [Member] |  |  |
Derivative Instruments |  |  |
Net Notional Amount of Interest Rate Agreements | $ 100,000,000.0 |  |
Derivative, Fixed Interest Rate | 1.57% |  |
Interest Rate Swap, 1.84% Maturing on April, 15, 2027 [Member] | Designated as Hedging Instrument [Member] |  |  |
Derivative Instruments |  |  |
Net Notional Amount Forward Starting Interest Rate Swap | $ 100,000,000.0 |  |
Derivative, Fixed Interest Rate | 1.84% |  |
Interest Rate Swap, 1.83% Maturing on April, 15, 2027 [Member] | Designated as Hedging Instrument [Member] |  |  |
Derivative Instruments |  |  |
Net Notional Amount Forward Starting Interest Rate Swap | $ 100,000,000.0 |  |
Derivative, Fixed Interest Rate | 1.83% |  |
Interest Rate Swap, 1.68% Maturing on September 30, 2029 [Member] | Designated as Hedging Instrument [Member] |  |  |
Derivative Instruments |  |  |
Net Notional Amount Forward Starting Interest Rate Swap | $ 100,000,000.0 |  |
Derivative, Fixed Interest Rate | 1.68% |  |
Interest Rate Swap, 1.74% Maturing on September 30, 2029 [Member] | Designated as Hedging Instrument [Member] |  |  |
Derivative Instruments |  |  |
Net Notional Amount Forward Starting Interest Rate Swap | $ 100,000,000.0 |  |
Derivative, Fixed Interest Rate | 1.74% |  |
Interest Rate Swap, 1.72% Maturing on September 30, 2029 [Member] | Designated as Hedging Instrument [Member] |  |  |
Derivative Instruments |  |  |
Net Notional Amount Forward Starting Interest Rate Swap | $ 150,000,000.0 |  |
Derivative, Fixed Interest Rate | 1.72% |  |
Interest Rate Cap [Member] |  |  |
Derivative Instruments |  |  |
Net Notional Amount of Interest Rate Agreements | $ 200,000,000.0 |  |
Derivative, Cap Interest Rate | 5.50% |  |
Interest Rate Swaps Average Remaining Maturity | 2 years |  |
Interest Rate Cap [Member] | Designated as Hedging Instrument [Member] |  |  |
Derivative Instruments |  |  |
Derivative, Notional Amount | $ 200,000,000.0 |  |
Forward Contracts [Member] | Designated as Hedging Instrument [Member] |  |  |
Derivative Instruments |  |  |
Interest Rate Swaps Average Remaining Maturity | 6 years 8 months 12 days |  |
Cash Flow Hedges | Designated as Hedging Instrument [Member] |  |  |
Derivative Instruments |  |  |
Unrealized gain on derivatives | $ (1,906,000) |  |
Derivative, Gain (Loss) on Derivative, Net | $ (3,621,000) |  |

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- Definition Weighted average remaining period until maturity of net outstanding interest rate swap agreements, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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