INTANGIBLE ASSETS

The components of intangible assets consisted of the following (amounts in thousands):



	Weighted Average Useful Lives (in Years)	March 31, 2016		December 31, 2015
Amortizable intangible assets:
Customer relationships	11.4	14,080		13,413
Patents, trademarks and other	8.6	13,968		13,237
Total at cost		28,048		26,650
Less accumulated amortization		(9,838	)	(8,852	)
		18,210		17,798

Amortization related to intangible assets for the three months ended March 31, 2016 and 2015, totaled $0.7 million and $0.8 million, respectively. Intangible assets are included as a component of other assets in the Consolidated Condensed Balance Sheet.

The estimated aggregate amortization expense at March 31, 2016, is as follows (amounts in thousands):



April 1 - December 31, 2016	$	1,748
2017	2,096
2018	2,096
2019	2,096
2020	2,096
Thereafter	8,078
	$	18,210