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Interest Rate Contracts - Summary of Interest Rate Swaps (Details) - USD ($) | Jun. 30, 2019 | Dec. 31, 2018
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Derivative [Line Items] |  |
Fair value of interest rate swap in a net asset (liability) position |  | $ (1,717,000)
Current Notional Amounts | $ 850,000,000 | 850,000,000
Interest Rate Swap Effective Date July 9, 2015 |  |
Derivative [Line Items] |  |
Interest Strike Rate (percent) | 1.69% |
Fair value of interest rate swap in a net asset (liability) position | $ 704,000 | 5,245,000
Current Notional Amounts | $ 425,000,000 | 425,000,000
Interest Rate Swap Effective Date July 1, 2020 |  |
Derivative [Line Items] |  |
Interest Strike Rate (percent) | 2.82% |
Fair value of interest rate swap in a net asset (liability) position | $ (6,785,000) | (1,987,000)
Current Notional Amounts | $ 125,000,000 | 125,000,000
Interest Rate Swap Effective Date July 1, 2020 |  |
Derivative [Line Items] |  |
Interest Strike Rate (percent) | 2.82% |
Fair value of interest rate swap in a net asset (liability) position | $ (5,449,000) | (1,628,000)
Current Notional Amounts | $ 100,000,000 | 100,000,000
Interest Rate Swap Effective Date July 1, 2020 |  |
Derivative [Line Items] |  |
Interest Strike Rate (percent) | 2.83% |
Fair value of interest rate swap in a net asset (liability) position | $ (5,464,000) | (1,636,000)
Current Notional Amounts | $ 100,000,000 | 100,000,000
Interest Rate Swap Effective Date July 1, 2020 |  |
Derivative [Line Items] |  |
Interest Strike Rate (percent) | 2.84% |
Fair value of interest rate swap in a net asset (liability) position | $ (5,547,000) | (1,711,000)
Current Notional Amounts | 100,000,000 | $ 100,000,000
Interest Rate Swap |  |
Derivative [Line Items] |  |
Fair value of interest rate swap in a net asset (liability) position | $ (22,541,000) |

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