Intangible Assets Other Than Goodwill

12 Months Ended

Dec. 31, 2015

Note 7—Intangible Assets Other Than Goodwill

Intangible assets other than goodwill consist primarily of licenses, product lines, customer relationships and trademarks. Amortized intangible assets are included in intangibles in the accompanying balance sheets. Trademarks are disclosed separately in the accompanying balance sheets. Debt offering costs from the issuance of the Company’s convertible senior notes are included in other long term assets in the accompanying balance sheets. Intangible assets and debt issuance costs are as follows (in thousands, except for weighted useful lives):

			December 31, 2014							December 31, 2015
	Weighted Useful Lives		Gross Carrying Amount		Accumulated Amortization			Net Amount		Gross Carrying Amount		Accumulated Amortization			Net Amount
	(Years)

Amortized Intangible Assets:
Licenses		4.96	$	91,488	$	(85,113	)	$	6,375	$	91,488	$	(86,994	)	$	4,494
Product lines		5.74		66,594		(27,235	)		39,359		67,794		(32,077	)		35,717
Customer relationships		5.21		9,348		(7,831	)		1,517		9,348		(8,391	)		957
Trade names		5.00		3,000		(1,450	)		1,550		3,000		(2,050	)		950
Non-compete/ Employment contracts		3.90		3,333		(3,230	)		103		3,333		(3,266	)		67
Total amortized intangible assets				173,763		(124,859	)		48,904		174,963		(132,778	)		42,185
Deferred Costs:
Debt issuance costs		3.77		14,923		(6,418	)		8,505		11,433		(4,782	)		6,651
Unamortized Intangible Assets:
Trademarks				2,308		―			2,308		2,308		―			2,308
			$	190,994	$	(131,277	)	$	59,717	$	188,704	$	(137,560	)	$	51,144

For the years ended December 31, 2013, 2014, and 2015, the Company’s aggregate amortization expense related to intangible assets and deferred costs was $10.6 million, $10.5 million, and $10.0 million, respectively. The Company currently estimates continuing future amortization expense to be approximately (in thousands):

2016	$	11,780
2017		10,589
2018		7,667
2019		5,255
2020		4,592
Thereafter		8,953
	$	48,836