Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2017

Fair Value Disclosures [Abstract]

Summary of Placement in the Fair Value Hierarchy of Financial Assets that are Measured at Fair Value on a Recurring Basis

The following table presents the placement in the fair value hierarchy of financial assets that are measured at fair value on a recurring basis, including the items for which the fair value option has been elected, at September 30, 2017:

	Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		September 30, 2017
Assets
U.S. government debt securities	$	—	$	43,985	$	—	$	43,985
Equity securities	19,830		6,812		—		26,642
Preferred stock	—		—		148,499		148,499
Other	—		7,089		—		7,089
Total	$	19,830	$	57,886	$	148,499	$	226,215

The following table presents the placement in the fair value hierarchy of financial assets that are measured at fair value on a recurring basis, including the items for which the fair value option has been elected, at December 31, 2016:

	Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		December 31, 2016
Assets
U.S. government debt securities	$	—	$	180,323	$	—	$	180,323
Equity securities	15,544		7,978		—		23,522
Preferred stock	—		—		129,545		129,545
Other	—		1,917		—		1,917
Total	$	15,544	$	190,218	$	129,545	$	335,307

Schedule of Changes in Level 3 Liabilities

The changes in the fair value of the Level 3 liabilities during the nine months ended September 30, 2017 were as follows:

	Nine Months Ended   September 30, 2017
Beginning balance	$	2,081
Acquisition date fair value of contingent consideration liability (Note 3)	585
Change in fair value of contingent consideration recognized in selling, general and administrative expenses	245
Ending balance	$	2,911