Fair Value Measurements (Details 2) - Level 3 - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015
Contingent Consideration
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Liability at January 1,	$ (350)	$ 0
New agreements	0	(350)
Sales proceeds	0	0
Realized Gains (Losses) included in Earnings	350	0
Unrealized Gains (Losses) included in Other Comprehensive Income	0	0
Fair value of impaired retail properties	0	0
Liability at December 31,	0	(350)
Convertible Debt Securities [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets (Liabilities) at January 1,	13,550
Assets (Liabilities) at December 31,		13,550
Convertible Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets (Liabilities) at January 1,	12,800	13,300
New agreements	2,500	750
Sales proceeds	(13,485)	(992)
Realized Gains (Losses) included in Earnings	729	492
Unrealized Gains (Losses) included in Other Comprehensive Income	0	0
Fair value of impaired retail properties	0	0
Assets (Liabilities) at December 31,	3,294	$ 12,800
Real Property
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Assets (Liabilities) at December 31,	$ 11,210

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, New Agreements

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Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, New Agreements

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of gain (loss) recognized in other comprehensive income (loss) for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of increase (decrease) of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of gain (loss) recognized in the income statement of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of gain (loss) recognized in other comprehensive income (loss) of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of sales of financial instrument classified as a derivative asset (liability) after deduction of derivative liability (asset), measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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