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Commitments and Contingencies - Litigation (Details) $ in Millions |  | 1 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2007 | Apr. 30, 2019 USD ($) | Jun. 30, 2019 lawsuit | Dec. 31, 2012 USD ($) | Dec. 31, 2011 USD ($) | Dec. 31, 2010 USD ($) | Dec. 31, 2009 USD ($) | Dec. 31, 2008 USD ($)
Call Option Lawsuits |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of lawsuits filed | lawsuit |  |  | 9 |  |  |  |  |
CRNF |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Property tax abatement period | 10 years |  |  |  |  |  |  |
Increase in property tax expense (in excess of) |  |  |  | $ 10.0 | $ 10.0 | $ 10.0 | $ 10.0 | $ 10.0
Litigation settlement agreement, recovery amount |  | $ 7.9 |  |  |  |  |  |

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