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Marketable Securities - Gains and Losses (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Gain (Loss) on Investments [Line Items] |  |
Amortized cost | $ 26,435 | $ 26,096
Gross unrealized holding gains | 68 | 117
Gross unrealized holding losses | (138) | (57)
Estimated fair value | 26,365 | 26,156
Less than 12 months, Estimated fair value | 11,930 |
Less than 12 months, Gross unrealized holding losses | (92) |
More than 12 months, Estimated fair value | 3,938 |
More than 12 months, Gross unrealized holding losses | (46) |
Total, Estimated fair value | 15,868 |
Total, Gross unrealized holding losses | (138) |
Corporate bonds and notes |  |
Gain (Loss) on Investments [Line Items] |  |
Amortized cost | 20,827 | 19,804
Gross unrealized holding gains | 50 | 89
Gross unrealized holding losses | (133) | (55)
Estimated fair value | 20,744 | 19,838
Less than 12 months, Estimated fair value | 10,256 |
Less than 12 months, Gross unrealized holding losses | (88) |
More than 12 months, Estimated fair value | 3,298 |
More than 12 months, Gross unrealized holding losses | (45) |
Total, Estimated fair value | 13,554 |
Total, Gross unrealized holding losses | (133) |
Municipal bonds |  |
Gain (Loss) on Investments [Line Items] |  |
Amortized cost | 5,608 | 6,292
Gross unrealized holding gains | 18 | 28
Gross unrealized holding losses | (5) | (2)
Estimated fair value | 5,621 | $ 6,318
Less than 12 months, Estimated fair value | 1,674 |
Less than 12 months, Gross unrealized holding losses | (4) |
More than 12 months, Estimated fair value | 640 |
More than 12 months, Gross unrealized holding losses | (1) |
Total, Estimated fair value | 2,314 |
Total, Gross unrealized holding losses | $ (5) |

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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