8. Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

Fair value of assets and liabilities measured on a recurring basis

At June 30, 2018 and December 31, 2017, the fair value measurements of our assets and liabilities measured on a recurring basis were as follows (in thousands):

	June 30, 2018
			Fair Value Measurements at Reporting Date Using
	Total Fair Value and Carrying Value on Balance Sheet		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents:
Money market funds	$	220,373	$	220,373	$	—	$	—
Marketable securities:
Foreign debt	299,961		—		299,961		—
Foreign government obligations	117,771		—		117,771		—
U.S. debt	38,562		—		38,562		—
Time deposits	654,127		654,127		—		—
Restricted investments	264,663		—		264,663		—
Derivative assets	3,757		—		3,757		—
Total assets	$	1,599,214	$	874,500	$	724,714	$	—
Liabilities:
Derivative liabilities	$	19,329	$	—	$	19,329	$	—

	December 31, 2017
			Fair Value Measurements at Reporting Date Using
	Total Fair Value and Carrying Value on Balance Sheet		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents:
Money market mutual funds	$	125,585	$	125,585	$	—	$	—
Marketable securities:
Foreign debt	238,858		—		238,858		—
Foreign government obligations	152,850		—		152,850		—
U.S. debt	73,671		—		73,671		—
Time deposits	255,000		255,000		—		—
Restricted investments	373,961		—		373,961		—
Derivative assets	4,303		—		4,303		—
Total assets	$	1,224,228	$	380,585	$	843,643	$	—
Liabilities:
Derivative liabilities	$	33,229	$	—	$	33,229	$	—

Fair value of financial instruments not measured on a recurring basis

At June 30, 2018 and December 31, 2017, the carrying values and fair values of our financial instruments not measured at fair value were as follows (in thousands):

	June 30, 2018				December 31, 2017
	Carrying Value		Fair Value		Carrying Value		Fair Value
Assets:
Notes receivable – noncurrent	$	9,650	$	9,642	$	10,495	$	10,516
Notes receivable, affiliate – current	21,398		23,620		20,411		23,317
Note receivable, affiliate – noncurrent	—		—		48,370		47,441
Liabilities:
Long-term debt, including current maturities (1)	$	468,823	$	471,974	$	406,388	$	416,486

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(1) Excludes capital lease obligations and unamortized discounts and issuance costs.