Goodwill and Other Long-Lived Assets (Tables)

6 Months Ended

Jun. 30, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

The following table presents the changes in the carrying amount of our goodwill for the six months ended June 30, 2016 (in thousands):



	Animal Hospital		Laboratory		All Other			Total
Balance as of December 31, 2015
Goodwill	$	1,402,106	$	101,269	$	144,332		$	1,647,707
Accumulated impairment losses	—		—		(130,057		)	(130,057		)
Subtotal	1,402,106		101,269		14,275			1,517,650
Goodwill acquired	434,323		—		512			434,835
Foreign translation adjustment	9,034		32		—			9,066
Other ⁽¹⁾	1,826		—		—			1,826
Balance as of June 30, 2016
Goodwill	1,847,289		101,301		144,844			2,093,434
Accumulated impairment losses	—		—		(130,057		)	(130,057		)
Subtotal	$	1,847,289	$	101,301	$	14,787		$	1,963,377

____________________________


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

Summary of Other Intangible Assets

Our acquisition related amortizable intangible assets at June 30, 2016 and December 31, 2015 are as follows (in thousands):



	As of June 30, 2016							As of December 31, 2015
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Non-contractual customer relationships	$	265,385	$	(61,093	)	$	204,292	$	116,082	$	(48,821	)	$	67,261
Covenants not-to-compete	20,785		(6,083		)	14,702		12,435		(4,779		)	7,656
Favorable lease assets	9,461		(5,644		)	3,817		9,441		(5,440		)	4,001
Technology	1,377		(697		)	680		1,377		(589		)	788
Trademarks	25,866		(5,328		)	20,538		10,551		(4,086		)	6,465
Franchise rights	11,730		(2,151		)	9,579		11,730		(1,564		)	10,166
Total	$	334,604	$	(80,996	)	$	253,608	$	161,616	$	(65,279	)	$	96,337

Estimated Amortization Expense Related to Intangible Assets

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



	Three Months Ended June 30,				Six Months Ended June 30,
	2016		2015		2016		2015
Aggregate amortization expense	$	9,798	$	5,858	$	16,026	$	11,384

The estimated amortization expense related to acquisition related intangible assets for the remainder of 2016 and each of the succeeding years thereafter, as of June 30, 2016, is as follows (in thousands):



Finite-lived intangible assets:
Remainder of 2016	$	21,950
2017	39,150
2018	35,719
2019	32,723
2020	27,868
Thereafter	96,198
Total	$	253,608
Indefinite-lived intangible assets:
Trademarks	4,040
Total intangible assets	$	257,648

Estimated Amortization Expense Related to Indefinite Intangible Assets



Finite-lived intangible assets:
Remainder of 2016	$	21,950
2017	39,150
2018	35,719
2019	32,723
2020	27,868
Thereafter	96,198
Total	$	253,608
Indefinite-lived intangible assets:
Trademarks	4,040
Total intangible assets	$	257,648