Fair Value Measurements (Significant Unobservable Inputs) (Details) - Nonrecurring [Member]	Dec. 31, 2019 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value	$ 25,984,000
Equity Method Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value	25,984,000
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value	24,154,000
Significant Unobservable Inputs (Level 3) [Member] | Equity Method Investments [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, fair value	$ 24,154,000
Alternative Investment, Valuation Technique [Extensible List]	us-gaap:ValuationTechniqueDiscountedCashFlowMember
Significant Unobservable Inputs (Level 3) [Member] | Measurement Input, Discount Rate [Member] | Equity Method Investments [Member] | Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset, measurement input	0.073
Significant Unobservable Inputs (Level 3) [Member] | Measurement Input, Discount Rate [Member] | Equity Method Investments [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset, measurement input	0.075
Significant Unobservable Inputs (Level 3) [Member] | Measurement Input, Cap Rate [Member] | Equity Method Investments [Member] | Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset, measurement input	0.058
Significant Unobservable Inputs (Level 3) [Member] | Measurement Input, Cap Rate [Member] | Equity Method Investments [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset, measurement input	0.080
Significant Unobservable Inputs (Level 3) [Member] | Measurement Input, Noncontrolling Interest Discount [Member] | Equity Method Investments [Member] | Maximum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset, measurement input	0.150