Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 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 March 31, 2017:

	Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		March 31, 2017
Assets
U.S. government debt securities	$	—	$	135,105	$	—	$	135,105
Equity securities	14,664		6,812		—		21,476
Preferred stock	—		—		134,661		134,661
Other	—		2,589		—		2,589
Total	$	14,664	$	144,506	$	134,661	$	293,831

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 liability during the three months ended March 31, 2017 were as follows:

	Three Months Ended   March 31, 2017
Beginning balance	$	2,081
Change in fair value of contingent consideration recognized in selling, general and administrative expenses	79
Ending balance	$	2,160