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Leases (Tables)
6 Months Ended
Jun. 30, 2020
Leases [Abstract]  
Components of Lease Expense
The components of lease expense were as follows (U.S. dollars in thousands):

 
Three Months Ended
June 30,
   
Six Months Ended
June 30,
 
   
2020
   
2019
   
2020
   
2019
 
Operating lease cost
 
$
12,869
   
$
12,417
   
$
26,005
   
$
25,278
 
Variable lease cost
   
410
     
1,105
     
1,384
     
2,157
 
Short-term lease cost
   
95
     
52
     
140
     
104
 
Sublease income
   
(1,058
)
   
(1,575
)
   
(2,189
)
   
(3,168
)
 Total lease expense
 
$
12,316
   
$
11,999
   
$
25,340
   
$
24,371
 
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,
 
   
2020
   
2019
 
Operating cash outflow from operating leases
 
$
25,955
   
$
26,570
 
Right-of-use assets obtained in exchange for lease obligations
 
$
31,178
   
$
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
 
2020
 
$
27,085
 
2021
   
46,780
 
2022
   
30,950
 
2023
   
21,409
 
2024
   
16,604
 
Thereafter
   
27,835
 
Total
   
170,663
 
Less: Finance charges
   
26,054
 
Total principal liability
 
$
144,609