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Fair Value Measurements | 3 Months Ended
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Mar. 31, 2013
Fair Value Disclosures [Abstract] |
Fair value measurements | Fair Value Measurements For a description on how we estimate fair value, see Note 3 to the consolidated financial statements in our 2012 Annual Report on Form 10-K. Recurring Fair Value Measurements The table below sets forth our financial assets and liabilities that are accounted for at fair value on a recurring basis as of March 31, 2013 and the hierarchy level of inputs used in measuring their respective fair values under applicable accounting standards (in thousands):
Description |  | Quoted Prices in Active Markets for Identical Assets(Level 1) |  | Significant Other Observable Inputs(Level 2) |  | Significant Unobservable Inputs(Level 3) |  | Total
Assets: |  |  |  |  |  |  |  |  |  |  |  |
Marketable securities in deferred compensation plan (1) |  |  |  |  |  |  |  |  |  |  |  |
Mutual funds |  | $ | 6,606 |  |  | $ | — |  |  | $ | — |  |  | $ | 6,606 |
Common stocks |  | 239 |  |  | — |  |  | — |  |  | 239 |
Other |  | 213 |  |  | — |  |  | — |  |  | 213 |
Common stock (1) |  | 743 |  |  | — |  |  | — |  |  | 743 |
Interest rate derivatives (2) |  | — |  |  | 260 |  |  | — |  |  | 260 |
Warrants to purchase common stock (2) |  | — |  |  | 420 |  |  | — |  |  | 420 |
Assets |  | $ | 7,801 |  |  | $ | 680 |  |  | $ | — |  |  | $ | 8,481 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |
Deferred compensation plan liability (3) |  | $ | 7,058 |  |  | $ | — |  |  | $ | — |  |  | $ | 7,058 |
Interest rate derivatives |  | — |  |  | 5,340 |  |  | — |  |  | 5,340 |
Liabilities |  | $ | 7,058 |  |  | $ | 5,340 |  |  | $ | — |  |  | $ | 12,398 |
Redeemable noncontrolling interest |  | $ | — |  |  | $ | — |  |  | $ | 10,356 |  |  | $ | 10,356 |
(1) Included in the line entitled “restricted cash and marketable securities” on our consolidated balance sheet. (2) Included in the line entitled “prepaid expenses and other assets” on our consolidated balance sheet. (3) Included in the line entitled “other liabilities” on our consolidated balance sheet. As discussed further in Note 5, our partner in a real estate joint venture has the right to require us to acquire its interest at fair value beginning in March 2020; accordingly, we classify the fair value of our partner’s interest as a redeemable noncontrolling interest in the mezzanine section of our consolidated balance sheet. In determining the fair value of our partner’s interest, we used a discount rate of 15.5%, which factored in risk appropriate to the level of future property development expected to be undertaken by the joint venture; a significant increase (decrease) in the discount rate used in determining the fair value would result in a significantly (lower) higher fair value. Given our reliance on the unobservable inputs, the valuations are classified in Level 3 of the fair value hierarchy. The carrying values of cash and cash equivalents, restricted cash, accounts receivable, other assets (excluding mortgage loans receivable) and accounts payable and accrued expenses are reasonable estimates of their fair values because of the short maturities of these instruments. We estimated the fair values of our mortgage loans receivable as discussed in Note 6 based on the discounted estimated future cash flows of the loans (categorized within Level 3 of the fair value hierarchy); the discount rates used approximate current market rates for loans with similar maturities and credit quality, and the estimated cash payments include scheduled principal and interest payments. For our disclosure of debt fair values in Note 7 to the consolidated financial statements, we estimated the fair value of our exchangeable senior notes based on quoted market prices for publicly-traded debt (categorized within Level 2 of the fair value hierarchy) and estimated the fair value of our other debt based on the discounted estimated future cash payments to be made on such debt (categorized within Level 3 of the fair value hierarchy); the discount rates used approximate current market rates for loans, or groups of loans, with similar maturities and credit quality, and the estimated future payments include scheduled principal and interest payments. Fair value estimates are made at a specific point in time, are subjective in nature and involve uncertainties and matters of significant judgment. Settlement of such fair value amounts may not be possible and may not be a prudent management decision. For additional fair value information, please refer to Note 6 for mortgage loans receivable, Note 7 for debt and Note 8 for interest rate derivatives. Nonrecurring Fair Value Measurements Three Months Ended March 31, 2013 During the three months ended March 31, 2013, we shortened the holding period for a property in the Baltimore/Washington Corridor that we expect to sell. We determined that the carrying amount of this property will not likely be recovered from the cash flows from the operation and sale of the property over the likely remaining holding period. Accordingly, we recognized a non-cash impairment loss of $1.9 million for the amount by which the carrying value of the property exceeded its estimated fair value. The table below sets forth the fair value hierarchy of the valuation technique used by us in determining the fair value of the property (dollars in thousands):
|  | Quoted Prices in |  |  |  | Significant |  |  |  |
|  | Active Markets for |  | Significant Other |  | Unobservable |  |  |  | Impairment
|  | Identical Assets |  | Observable Inputs |  | Inputs |  |  |  | Losses
Description |  | (Level 1) |  | (Level 2) |  | (Level 3) |  | Total |  | Recognized
Assets (1): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Properties, net |  | $ | — |  |  | $ | — |  |  | $ | 7,250 |  |  | $ | 7,250 |  |  | $ | 1,857 |
(1) Reflects balance sheet classifications of assets at time of fair value measurement, excluding the effect of held for sale classifications. The table below sets forth quantitative information about significant unobservable inputs used for the Level 3 fair value measurements reported above (dollars in thousands):
Description |  | Fair Value on Measurement Date |  | Valuation Technique |  | Unobservable Input |  | Range (Weighted Average)
Property on which impairment loss was recognized |  | $ | 7,250 |  |  | Bid for property indicative of value |  | Indicative bid (1) |  | (1)
(1) This fair value measurement was developed by a third party source, subject to our corroboration for reasonableness. Three Months Ended March 31, 2012 During the three months ended March 31, 2012, we recognized non-cash impairment losses of $5.5 million for the amount by which the carrying values of certain properties exceeded their estimated fair values. The table below sets forth the fair value hierarchy of the valuation techniques used by us in determining such fair values for the three months ended March 31, 2012 (dollars in thousands):
|  | Quoted Prices in |  |  |  | Significant |  |  |  |
|  | Active Markets for |  | Significant Other |  | Unobservable |  |  |  | Impairment
|  | Identical Assets |  | Observable Inputs |  | Inputs |  |  |  | Losses
Description |  | (Level 1) |  | (Level 2) |  | (Level 3) |  | Total |  | Recognized (1)
Assets (2): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Properties, net |  | $ | — |  |  | $ | — |  |  | $ | 92,176 |  |  | $ | 92,176 |  |  | $ | 5,479 |
(1) Represents impairment losses, excluding exit costs incurred of $1.1 million. (2) Reflects balance sheet classifications of assets at time of fair value measurement, excluding the effect of held for sale classifications. The table below sets forth quantitative information about significant unobservable inputs used for the Level 3 fair value measurements reported above (dollars in thousands):
Description |  | Fair Value on Measurement Date |  | Valuation Technique |  | Unobservable Input |  | Range (Weighted Average)
Properties on which impairment losses were recognized |  | $ | 92,176 |  |  | Bid for properties indicative of value |  | Indicative bid (1) |  | (1)
|  |  |  | Contract of sale |  | Contract price (1) |  | (1)
|  |  |  | Discounted cash flow |  | Discount rate |  | 11.0% (2)
|  |  |  |  |  | Terminal capitalization rate |  | 9.0% (2)
|  |  |  |  |  | Market rent growth rate |  | 3.0% (2)
|  |  |  |  |  | Expense growth rate |  | 3.0% (2)
|  |  |  | Yield Analysis |  | Yield |  | 12% (2)
|  |  |  |  |  | Market rent rate |  | $8.50 per square foot (2)
|  |  |  |  |  | Leasing costs |  | $20.00 per square foot (2)
(1) These fair value measurements were developed by third party sources, subject to our corroboration for reasonableness. (2) Only one value applied for this unobservable input.

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13504-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 15C, 15D -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 44A, 44B -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 15A -Subparagraph a-d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 3, 10, 14, 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 17-22, 27, 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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