Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2016

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, as of 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

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, as of December 31, 2015:

	Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		December 31, 2015
Assets
U.S. government debt securities	$	—	$	207,704	$	—	$	207,704
Equity securities	65,850		17,803		—		83,653
Other	—		405		—		405
Total	$	65,850	$	225,912	$	—	$	291,762

Schedule of Changes in Level 3 Liabilities

The changes in the fair value of the Level 3 liability during the year ended December 31, 2016 were as follows:

	2016
Beginning balance	$	—
Fair value of contingent consideration assumed in asset acquisition	3,660
Payment of contingent consideration (Note 4)	(1,583		)
Change in fair value of contingent consideration recognized in selling, general and administrative expenses	4
Ending balance	$	2,081