Goodwill and Other Long-Lived Assets (Tables)

3 Months Ended

Mar. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill

The following table presents the changes in the carrying amount of our goodwill for the three months ended March 31, 2017 (in thousands):

	Animal Hospital			Laboratory		All Other			Total
Balance as of December 31, 2016
Goodwill	$	2,047,894		$	101,283	$	145,302		$	2,294,479
Accumulated impairment losses	—			—		(130,057		)	(130,057		)
Subtotal	2,047,894			101,283		15,245			2,164,422
Goodwill acquired	75,884			—		—			75,884
Foreign translation adjustment	1,733			5		—			1,738
Other (1)	(13,855		)	—		—			(13,855		)
Balance as of March 31, 2017
Goodwill	2,111,656			101,288		145,302			2,358,246
Accumulated impairment losses	—			—		(130,057		)	(130,057		)
Subtotal	$	2,111,656		$	101,288	$	15,245		$	2,228,189

 ____________________________

⁽¹⁾  "Other" consists primarily of measurement period adjustments.

Summary of Other Intangible Assets

Our acquisition related amortizable intangible assets as of March 31, 2017 and December 31, 2016 are as follows (in thousands):

	As of March 31, 2017							As of December 31, 2016
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Non-contractual customer relationships	$	228,148	$	(71,469	)	$	156,679	$	218,847	$	(62,331	)	$	156,516
Covenants not-to-compete	25,592		(8,776		)	16,816		23,990		(7,580		)	16,410
Favorable lease assets	6,503		(3,008		)	3,495		9,451		(5,855		)	3,596
Technology	1,377		(845		)	532		1,377		(795		)	582
Trademarks	30,314		(8,974		)	21,340		30,144		(7,713		)	22,431
Client lists	10		(1		)	9		10		(1		)	9
Franchise rights	11,730		(3,030		)	8,700		11,730		(2,737		)	8,993
Total	$	303,674	$	(96,103	)	$	207,571	$	295,549	$	(87,012	)	$	208,537

Estimated Amortization Expense Related to Intangible Assets

The following table summarizes our aggregate amortization expense related to other intangible assets (in thousands):

	Three Months Ended March 31,
	2017		2016
Aggregate amortization expense	$	11,425	$	6,228

Estimated Amortization Expense Related to Indefinite Intangible Assets

The estimated amortization expense related to other intangible assets for the remainder of 2017 and each of the succeeding years thereafter, as of March 31, 2017, is as follows (in thousands):

Definite-lived intangible assets:
Remainder of 2017	$	33,413
2018	41,576
2019	38,461
2020	33,532
2021	23,264
Thereafter	37,325
Total	$	207,571
Indefinite-lived intangible assets:
Trademarks	4,059
Total intangible assets	$	211,630