Commitments (Tables)

12 Months Ended

Dec. 31, 2018

Commitments And Contingencies Disclosure [Abstract]

Schedule of Future Minimum Lease Payments Under Operating Leases

Future minimum lease payments under operating leases as of December 31, 2018 are as follows:

(U.S. Dollars, in thousands)
2019	$	3,330
2020		2,729
2021		2,946
2022		2,818
2023		1,727
Thereafter		11,372
Total	$	24,922