GOODWILL AND INTANGIBLE ASSETS

Goodwill, and the changes in the carrying amount of goodwill for the years ended December 31, 2018 and 2017, are as follows (in thousands):



Balance at December 31, 2016	$	365,947
Adjustments associated with the acquisition of Home Solutions	1,251
Balance at December 31, 2017	$	367,198
Adjustments	—
Balance at December 31, 2018	$	367,198

Intangible assets consisted of the following (in thousands):



	December 31, 2018							December 31, 2017
	Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization			Net Carrying Amount
Infusion customer relationships	$	25,650	$	(25,650	)	$	—	$	25,650	$	(25,650	)	$	—
Managed care contracts	25,000		(14,576		)	10,424		25,000		(8,403		)	16,597
Licenses	5,400		(5,400		)	—		5,400		(3,681		)	1,719
Trade name	1,800		(1,800		)	—		1,800		(1,181		)	619
Non-compete agreements	1,700		(1,654		)	46		1,700		(1,521		)	179
	$	59,550	$	(49,080	)	$	10,470	$	59,550	$	(40,436	)	$	19,114

Intangible assets are amortized on a straight-line basis over their estimated useful lives as follows:



	Estimated Useful Life
Infusion customer relationships	5	months		-	4	years
Managed care contracts					4	years
Licenses					2	years
Trade name					2	years
Non-compete agreements		1	year	-	5	years

Total amortization expense of intangible assets was $8.6 million, $11.8 million, and $6.2 million for the years ended December 31, 2018, 2017 and 2016, respectively. Amortization expense is expected to be the following (in thousands):



Year ending December 31,	Estimated Amortization
2019	$	6,218
2020	4,252
Total estimated amortization expense	$	10,470