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Other Investments (Schedule of Other Investments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Equity method investments, carrying value	$ 293,017		$ 293,017		$ 321,241
Earnings (losses) from equity method investments	(7,278)	$ 5,515	(3,946)	$ 11,217
Impairment on foreign equity method investment			10,000
Other strategic investments
Schedule of Equity Method Investments [Line Items]
Equity method investments, carrying value	6,789		6,789		13,618
Earnings (losses) from equity method investments	(9,679)	360	(10,173)	607
Real estate equity investments
Schedule of Equity Method Investments [Line Items]
Equity method investments, carrying value	286,228		286,228		307,623
Earnings (losses) from equity method investments	2,401	5,155	6,227	10,610
Real estate equity investments | Net lease venture
Schedule of Equity Method Investments [Line Items]
Equity method investments, carrying value	0		0		121,139
Earnings (losses) from equity method investments	2,016	1,032	4,100	2,013
Real estate equity investments | Safety, Income and Growth, Inc.
Schedule of Equity Method Investments [Line Items]
Equity method investments, carrying value	147,512		147,512		83,868
Earnings (losses) from equity method investments	680	48	2,152	48
Real estate equity investments | Other real estate equity investments
Schedule of Equity Method Investments [Line Items]
Equity method investments, carrying value	138,716		138,716		$ 102,616
Earnings (losses) from equity method investments	$ (295)	$ 4,075	$ (25)	$ 8,549

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+ References

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-Publisher FASB
-Name Accounting Standards Codification
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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