Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2018

Intangible Assets

Schedule of gross carrying amount and related accumulated amortization of the intangible assets

The following sets forth the gross carrying amount and related accumulated amortization of the intangible assets, in thousands of dollars:

	Weighted-	December 31,		December 31,
	Average Life	2018		2017
Capitalized patent defense costs	4.00 - 8.25 years	$	44,724	$	44,185
Less accumulated amortization			(13,356)		(8,166)
		$	31,368	$	36,019