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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

X

- 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

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- Definition

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