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Investments in debt and equity securities (Tables)

12 Months Ended

Dec. 31, 2016

Investments Debt And Equity Securities [Abstract]

Investments

The Company’s investments in securities and certain other financial instruments consist of the following:

		December 31, 2016												December 31, 2015
		Held to maturity				Available for sale				Total				Held to maturity				Available for sale				Total
Certificates of deposit, commercial paper and money    market funds due within one year		$	256,827			$	—			$	256,827			$	406,884			$	—			$	406,884
Investments in mutual funds and common stock			50,000				47,404				97,404				—				33,482				33,482
Cash surrender value of life insurance policies			—				59,646				59,646				—				56,840				56,840
		$	306,827			$	107,050			$	413,877			$	406,884			$	90,322			$	497,206
Short-term investments		$	306,827			$	3,371			$	310,198			$	406,884			$	1,200			$	408,084
Long-term investments			—				103,679				103,679				—				89,122				89,122
		$	306,827			$	107,050			$	413,877			$	406,884			$	90,322			$	497,206

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- References

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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 320
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26626-111562

Reference 2: 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 3: 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=73527792&loc=d3e27232-111563

Reference 4: 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=66010992&loc=d3e26610-111562

Reference 5: 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=73527792&loc=d3e27161-111563

Reference 6: 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

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