Discontinued Operations (Cash Flows of Discontinued Operations) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Depreciation and amortization	$ (627)	$ (642)
Non-cash investing and financing activities:
Decrease in debt		6,712
Decrease in noncontrolling interests		83,909
Discontinued Operations, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Depreciation and amortization		26
Non-cash investing and financing activities:
Decrease in loans		(231)
Decrease in other assets		(35,715)
Decrease in debt		8,308
Decrease in accounts payable and accrued expenses		7,201
Decrease in other liabilities		5,333
Increase in accumulated other comprehensive income		(3,404)
Consolidated Funds and Ventures | Discontinued Operations, 2018
Non-cash investing and financing activities:
Decrease in investments in debt securities		(5,450)
Decrease in other assets		24,140
Decrease in debt		6,144
Decrease in other liabilities		480
Decrease in noncontrolling interests		$ 5,620