Financial Instruments and Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2019

Financial Instruments and Fair Value Measurements

Schedule of Financial Instruments Measured at Fair Value on Recurring Basis

	September 30, 2019
							Total Fair
	Level 1		Level 2		Level 3		Value
Cash equivalents:
Money market funds	$	6,916	$	—	$	—	$	6,916
Commercial paper		138,357		—		—		138,357
U.S. Treasury securities		6,998		—		—		6,998
		152,271		—		—		152,271
Investments - debt securities:
Corporate debt securities		—		35		—		35
		—		35		—		35
Investments - equity securities:
Preferred stock		10,825		24,349		—		35,174
Common stock		1,900		—		—		1,900
		12,725		24,349		—		37,074
Restricted investments:
Short-term bond		2,240		—		—		2,240
Money market fund		113		—		—		113
		2,353		—		—		2,353
	$	167,349	$	24,384	$	—	$	191,733

	December 31, 2018
							Total Fair
	Level 1		Level 2		Level 3		Value
Cash equivalents:
Money market funds	$	43,346	$	—	$	—	$	43,346
Commercial paper		107,586		—		—		107,586
U.S. Treasury securities		29,998		—		—		29,998
		180,930		—		—		180,930
Investments - debt securities:
U.S. Treasury securities		6,937		—		—		6,937
Corporate debt securities		—		2,021		—		2,021
		6,937		2,021		—		8,958
Investments - equity securities:
Preferred stock		10,470		25,662		—		36,132
Restricted investments:
Short-term bond		3,265		—		—		3,265
Money market fund		167		—		—		167
		3,432		—		—		3,432
	$	201,769	$	27,683	$	—	$	229,452

Schedule of Liabilities Measured at Fair Value on Recurring Basis

		September 30, 2019
	Location in							Total Fair
	Balance Sheet	Level 1		Level 2		Level 3		Value
Derivative Liabilities:
Interest rate swap	Other liabilities	$	—	$	509	$	—	$	509
		$	—	$	509	$	—	$	509

Schedule of Carrying Amount and Fair Value Measured on Nonrecurring Basis of Financial Instruments

	September 30, 2019					December 31, 2018
	Carrying					Carrying
	value		Fair value		Level	value		Fair value		Level
Assets
Investments held by SPEs:
Time deposit	$	200,000	$	200,000	3	$	200,000	$	200,000	3
U.S. Treasury securities and cash	$	6,728	$	6,736	1	$	7,384	$	7,092	1
Liabilities
Senior Notes held by SPE	$	176,962	$	208,957	3	$	176,775	$	193,293	3