Leases (Tables)

6 Months Ended

Jun. 30, 2019

Leases [Abstract]

Components of Lease Expense

The components of lease expense were as follows (U.S. dollars in thousands):

	Three Months Ended June 30, 2019		Six Months Ended June 30, 2019
Operating lease cost	$	12,417	$	25,278
Short-term lease cost		52		104
Variable lease cost		1,105		2,157
	$	13,574	$	27,539

Supplemental Cash Flow Information Related to Leases

Supplemental cash flow information related to leases was as follows (U.S. dollars in thousands):

	Six Months Ended June 30, 2019
Operating cash outflow from operating leases	$	26,570
ROU assets obtained in exchange for lease obligations		140,585

Maturities of Operating Lease Liabilities

Maturities of lease liabilities were as follows (U.S. dollars in thousands):

Year Ending December 31,	Operating leases
2019	$	23,632
2020		37,424
2021		30,478
2022		16,439
2023		11,574
Thereafter		15,514
Total		135,061
Less: Finance charges		13,794
Total principal liability	$	121,267

Minimum Future Operating Leases and Financing Obligations

Under ASC Topic 840, minimum future operating leases and financing obligations at December 31, 2018 are as follows (U.S. dollars in thousands):

Year Ending December 31,	Operating leases		Finance leases
2019	$	39,358	$	726
2020		27,553		748
2021		20,266		757
2022		11,723		770
2023		9,950		794
Thereafter		7,628		1,148
Total minimum lease payments	$	116,478	$	4,943