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Interest Rate Contracts - Narrative (Details) | Aug. 31, 2018 USD ($) contract | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
--- | --- | --- | ---
Derivative [Line Items] |  |  |
Derivative notional amount |  | $ 850,000,000 | $ 850,000,000
Income expected to be recognized in earnings in next 12 months |  | 700,000 |
Interest Rate Swap Effective Date July 1, 2020, $425,000 Notional Amount |  |  |
Derivative [Line Items] |  |  |
Number of interest rate swap agreements executed | contract | 4 |  |
Derivative notional amount | $ 425,000,000 |  |
Derivative contract term | 5 years |  |
Interest Rate Swap |  |  |
Derivative [Line Items] |  |  |
Fair value of interest rate swap in a net liability position |  | $ 23,300,000 | $ 1,700,000

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