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Fair Value Measurements (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Investments, fair value disclosure | $ 26,365 | $ 26,156
Corporate bonds and notes |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investments, fair value disclosure | 20,744 | 19,838
Municipal bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investments, fair value disclosure | 5,621 | 6,318
Level 1 |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investments, fair value disclosure | 0 | 0
Level 1 | Corporate bonds and notes |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investments, fair value disclosure | 0 | 0
Level 1 | Municipal bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investments, fair value disclosure | 0 | 0
Level 2 |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investments, fair value disclosure | 26,365 | 26,156
Level 2 | Corporate bonds and notes |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investments, fair value disclosure | 20,744 | 19,838
Level 2 | Municipal bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investments, fair value disclosure | 5,621 | 6,318
Level 3 |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investments, fair value disclosure | 0 | 0
Level 3 | Corporate bonds and notes |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investments, fair value disclosure | 0 | 0
Level 3 | Municipal bonds |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Investments, fair value disclosure | $ 0 | $ 0

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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph a, f, g -Article 7 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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