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Fair Value Measurements and Disclosures | 12 Months Ended
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Dec. 31, 2015
Fair Value Disclosures [Abstract] |
Fair Value Measurements and Disclosures | Fair Value Measurements and Disclosures Assets and Liabilities Reported at Fair Value The only assets we record at fair value on our consolidated financial statements are the marketable securities related to our Deferred Compensation Plan (see Note 14 “Employee Benefit Plans” for additional information). The following table sets forth the fair value of our marketable securities as of December 31, 2015 and 2014:
| Fair Value (Level 1) (1)
| 2015 |  | 2014
Description | (in thousands)
Marketable securities (2) | $ | 12,882 |  |  | $ | 11,971 |
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(1) | Fair value calculated using Level 1 inputs based on quoted prices in active markets for identical securities.
(2) | The marketable securities are held in a limited rabbi trust.
We report the change in the fair value of the marketable securities at the end of each accounting period in interest income and other net investment gains in the consolidated statements of operations. We also adjust the related Deferred Compensation Plan liability to fair value at the end of each accounting period based on the performance of the benchmark funds selected by each participant, which results in a corresponding increase or decrease to compensation cost for the period. The following table sets forth the net (loss) gain on marketable securities recorded during the years ended December 31, 2015, 2014 and 2013:
| December 31,
| 2015 |  | 2014 |  | 2013
Description | (in thousands)
Net (loss) gain on marketable securities | $ | (269 | ) |  | $ | 397 |  |  | $ | 1,489 |
Financial Instruments Disclosed at Fair Value The following table sets forth the carrying value and the fair value of our other financial instruments as of December 31, 2015 and 2014:
| December 31,
| 2015 |  | 2014
| Carrying Value |  | Fair Value |  | Carrying Value |  | Fair Value
| (in thousands)
Liabilities |  |  |  |  |  |  |
Secured debt (1) | $ | 381,918 |  |  | $ | 391,611 |  |  | $ | 546,292 |  |  | $ | 559,483 |
Unsecured debt, net (2) | 1,856,590 |  |  | 1,898,863 |  |  | 1,783,121 |  |  | 1,858,492 |
Unsecured line of credit (1) | — |  |  | — |  |  | 140,000 |  |  | 145,051 |
_______________
(1) | Fair value calculated using Level II inputs, which are based on model-derived valuations in which significant inputs and significant value drivers are observable in active markets.
(2) | Fair value calculated using Level II inputs as of December 31, 2015, which are based on model-derived valuations in which significant inputs and significant value drivers are observable in active markets. Fair value calculated using primarily Level I inputs as of December 31, 2014, which are based on quoted prices for identical instruments in active markets. The carrying value and fair value of the instruments valued using Level I inputs was $1,269.4 million and $1,322.2 million, respectively, as of December 31, 2014. The carrying value and fair value of the instruments valued using Level II inputs was $513.7 million and $536.3 million, respectively, as of December 31, 2014.

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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 820 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14064-108612 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13537-108611 Reference 5: 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=35750535&loc=d3e13504-108611 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=35750535&loc=d3e13433-108611 + Details
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