Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2019

Fair Value Disclosures [Abstract]

Summary of Assets and (Liabilities) Measured at Fair Value on a Recurring Basis

The following table summarizes our assets and (liabilities) at June 30, 2019 and December 31, 2018, respectively, that are measured at fair value on a recurring basis subsequent to initial recognition and indicates the fair value hierarchy of the valuation techniques utilized by us to determine such fair value (in thousands):

	Level	June 30, 2019			December 31, 2018
Deferred compensation plan assets	1	$	100,365		$	84,435
Available-for-sale debt securities	1	$	60,707		$	56,556
Deferred compensation plan liabilities	1	$	(100,365	)	$	(84,435	)
Interest rate swaps	2	$	(427	)	$	1,096
Contingent purchase price liabilities	3	$	(28,005	)	$	(39,708	)

Change in Level 3 Fair Values of Contingent Purchase Price Liabilities

During the six months ended June 30, 2019 and 2018, there were no transfers between the valuation hierarchy Levels 1, 2 and 3. The following table summarizes the change in Level 3 fair values of our contingent purchase price liabilities for the six months ended June 30, 2019 and 2018 (pre-tax basis) (in thousands):

	2019			2018
Beginning balance – January 1	$	(39,708	)	$	(37,574	)
Additions from business acquisitions		(1,806	)		(12,361	)
Settlement of contingent purchase price liabilities		13,316			6,457
Change in fair value of contingencies		561			(2,562	)
Change in net present value of contingencies		(368	)		(488	)
Ending balance – June 30	$	(28,005	)	$	(46,528	)