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Notes Payable - Gains on Repurchase of Outstanding Debt (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($)
Debt Disclosure [Abstract] |
Extinguishment of Debt, Amount | $ 0.0

X
- References No definition available. + Details
Name: | us-gaap_DebtDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Gross amount of debt extinguished. + References No definition available. + Details
Name: | us-gaap_ExtinguishmentOfDebtAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration