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Marketable Securities: | 3 Months Ended
--- | ---
Mar. 31, 2012
Marketable Securities: |
Marketable Securities: |
7. Marketable Securities: Marketable securities consist of the following:
|  | March 31, 2012 |  | December 31, 2011 |
--- | --- | --- | --- | --- | ---
Government debt securities, at par value |  | $ | 25,048 |  | $ | 25,147 |
Less discount |  |  | (256 | ) |  | (314 | )
|  |  | 24,792 |  |  | 24,833 |
Unrealized gain |  |  | 1,499 |  |  | 1,803 |
Fair value (Level 1 measurement) |  | $ | 26,291 |  | $ | 26,636 |
Future contractual maturities of marketable securities are as follows:
1 year or less |  | $ | 1,378 |
2 to 5 years |  |  | 23,670 |
|  | $ | 25,048 |
The proceeds from maturities and interest receipts from the marketable securities are restricted to the service of the Greeley Note (See Note 11—Bank and Other Notes Payable).

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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2,12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563 + Details
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