Goodwill and Other Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2016

Goodwill and Other Intangible Assets [Abstract]

Goodwill and Indefinite Life Intangible Assets

Goodwill and other intangible assets consist of the following (U.S. dollars in thousands):

	Carrying Amount at December 31,
Goodwill and indefinite life intangible assets:	2015		2016
Goodwill	$	112,446	$	114,954
Trademarks and trade names		24,599		24,599
Other indefinite lived intangibles		—		3,763
	$	137,045	$	143,316

Finite Life Intangible Assets

	December 31, 2015				December 31, 2016
Finite life intangible assets:	Gross Carrying Amount		Accumulated Amortization		Gross Carrying Amount		Accumulated Amortization		Weighted-average  Amortization Period
Scanner technology	$	46,482	$	33,590	$	46,482	$	36,624	18 years
Developed technology		22,500		17,558		22,500		18,383	20 years
Distributor network		11,598		11,096		11,598		11,598	15 years
Trademarks		2,409		879		2,592		1,011	15 years
Other		45,315		22,771		46,219		26,584	8 years
	$	128,304	$	85,894	$	129,391	$	94,200	15 years

Annual Estimated Future Amortization Expense

The estimated annual amortization expense for each of the five succeeding fiscal years are as follows (U.S. dollars in thousands):

Year Ending December 31,
2017	$	8,460
2018		8,650
2019		8,480
2020		4,160
2021		2,730