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Fair Values (Schedule of Fair Value Measurement) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Mar. 31, 2021
Assets and liabilities recorded at fair value
Derivative liabilities		$ 19,000	$ 14,200
Loan receivable held for sale (refer to Note 7)	[1]	0	16,086
Other investments	[1]	1,176,560	1,237,295
Recurring Basis | Fair Value
Assets and liabilities recorded at fair value
Derivative liabilities		18,926	14,178
Available-for-sale securities		25,274	24,043
Loan receivable held for sale (refer to Note 7)			16,086
Recurring Basis | Quoted market prices in active markets (Level 1)
Assets and liabilities recorded at fair value
Derivative liabilities		0	0
Available-for-sale securities		0	0
Loan receivable held for sale (refer to Note 7)			0
Recurring Basis | Significant other observable inputs (Level 2)
Assets and liabilities recorded at fair value
Derivative liabilities		18,926	14,178
Available-for-sale securities		0	0
Loan receivable held for sale (refer to Note 7)			0
Recurring Basis | Significant unobservable inputs (Level 3)
Assets and liabilities recorded at fair value
Derivative liabilities		0	0
Available-for-sale securities		25,274	24,043
Loan receivable held for sale (refer to Note 7)			16,086
Non-recurring Basis
Assets and liabilities recorded at fair value
Aggregate impairments		1,300
Non-recurring Basis | Fair Value
Assets and liabilities recorded at fair value
Other investments			75,402
Impaired land and development		6,078
Non-recurring Basis | Quoted market prices in active markets (Level 1)
Assets and liabilities recorded at fair value
Other investments			0
Impaired land and development		0
Non-recurring Basis | Significant other observable inputs (Level 2)
Assets and liabilities recorded at fair value
Other investments			75,402
Impaired land and development		0
Non-recurring Basis | Significant unobservable inputs (Level 3)
Assets and liabilities recorded at fair value
Other investments			$ 0
Impaired land and development		$ 6,078
[1] (1)Refer to Note 2 for details on the Company's consolidated variable interest entities ("VIEs").

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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