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Fair Value Measurements and Disclosures (Tables) | 12 Months Ended
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Dec. 31, 2020
Fair Value Disclosures [Abstract] |
Fair value of the company's marketable securities | The following table sets forth the fair value of our marketable securities as of December 31, 2020 and 2019:
| Fair Value (Level 1) (1)
| 2020 |  | 2019
Description | (in thousands)
Marketable securities (2) | $ | 27,481 |  |  | $ | 27,098 |
____________________ (1)Based on quoted prices in active markets for identical securities. (2)The marketable securities are held in a limited rabbi trust.
Net (loss) gain on marketable securities | The following table sets forth the net gain (loss) on marketable securities recorded during the years ended December 31, 2020, 2019 and 2018:
| December 31,
| 2020 |  | 2019 |  | 2018
Description | (in thousands)
Net gain (loss) on marketable securities | $ | 2,864 |  |  | $ | 3,885 |  |  | $ | (1,851) |
Carrying value and fair value of other financial instruments | The following table sets forth the carrying value and the fair value of our other financial instruments as of December 31, 2020 and 2019:
| December 31,
| 2020 |  | 2019
| Carrying Value |  | Fair Value (1) |  | Carrying Value |  | Fair Value (1)
| (in thousands)
Liabilities |  |  |  |  |  |  |
Secured debt, net | $ | 253,582 |  |  | $ | 282,559 |  |  | $ | 258,593 |  |  | $ | 272,997 |
Unsecured debt, net | 3,670,099 |  |  | 4,089,339 |  |  | 3,049,185 |  |  | 3,252,217 |
Unsecured line of credit | — |  |  | — |  |  | 245,000 |  |  | 245,195 |
_______________ (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.

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- Definition Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2C -URI http://asc.fasb.org/extlink&oid=117815213&loc=SL7498348-110258 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of realized and unrealized gain (loss) on investment in security. + References No definition available. + Details
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