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Risk Management and Derivatives (Risk Concentrations, Property Type) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2013 risk_component | Dec. 31, 2012
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |  |  |
Number of components of economic risk | 3 |  |  |
Investment [Line Items] |  |  |  |
Real Estate Investment Property, Accumulated Depreciation | $ 424,453 |  | $ 378,306 |
Financing receivable, allowance for credit losses, collectively evaluated for impairment | $ 29,200 | [1] | $ 33,100 | [1]
Land |  |  |  |
Investment [Line Items] |  |  |  |
% of Total | 21.60% |  |  |
Office |  |  |  |
Investment [Line Items] |  |  |  |
% of Total | 15.20% |  |  |
Industrial / R&D |  |  |  |
Investment [Line Items] |  |  |  |
% of Total | 13.50% |  |  |
Entertainment / Leisure |  |  |  |
Investment [Line Items] |  |  |  |
% of Total | 10.70% |  |  |
[1] | The carrying value of these loans include unamortized discounts, premiums, deferred fees and costs aggregating to a net discount of $4.6 million and $3.8 million as of December 31, 2013 and 2012, respectively.

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- Definition For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13537-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13531-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592 + Details
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- Definition The cumulative amount of depreciation for real estate property held for investment purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(3)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 7 + Details
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