Intangible Assets

12 Months Ended

Dec. 31, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets

Intangible Assets

Intangible assets, the majority of which were acquired in the acquisition of TIW, consist of the following:

	Estimated Useful Lives	2016						2015
		Gross Book Value		Accumulated Amortization		Net Book Value		Gross Book Value		Accumulated Amortization		Net Book Value
		(In thousands)
Trademarks	indefinite	$	8,416	$	—	$	8,416	$	—	$	—	$	—
Patents	15 - 30 years	3,583		294		3,289		248		248		—
Customer relationships	5 - 15 years	18,057		168		17,889		—		—		—
		$	30,056	$	462	$	29,594	$	248	$	248	$	—

Amortization expense was $0.2 million, none and none for 2016, 2015 and 2014, respectively. Based on the carrying value of intangible assets at December 31, 2016, amortization expense for the subsequent five years is estimated to be as follows: 2017—$1.5 million; 2018—$1.5 million; 2019—$1.5 million; 2020—$1.5 million; and 2021—$1.5 million.