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Supplemental Cash Flow Information
 6 Months Ended
Jun. 30, 2019
Supplemental Cash Flow Elements [Abstract]  
Supplemental Cash Flow Information SUPPLEMENTAL CASH FLOW INFORMATION:
The net effects of changes in operating assets and liabilities, net of non-cash transactions, on cash flows from operating activities are as follows (in thousands):
 
 
Three Months Ended
 
Six Months Ended
 
 
June 30,
 
June 30,
 
 
2019
 
2018
 
2019
 
2018
Accounts and notes receivable
 
$
(56,322
)
 
$
(45,089
)
 
$
(215,791
)
 
$
(176,801
)
Contract assets
 
(107,165
)
 
(56,934
)
 
(101,898
)
 
(63,118
)
Inventories
 
13,091

 
8,277

 
42,087

 
(5,405
)
Prepaid expenses and other current assets
 
(73,235
)
 
(39,251
)
 
(102,574
)
 
(57,993
)
Accounts payable and accrued expenses and other non-current liabilities
 
44,543

 
151,001

 
(22,135
)
 
123,790

Contract liabilities
 
67,390

 
(6,212
)
 
44,010

 
71,062

Other, net (1)
 
(123,795
)
 
(8,642
)
 
(129,348
)
 
(5,979
)
Net change in operating assets and liabilities, net of non-cash transactions
 
$
(235,493
)
 
$
3,150

 
$
(485,649
)
 
$
(114,444
)


(1) The amounts for the three and six months ended June 30, 2019 include the payment of $87 million of on-demand advance payment bonds and $25 million of on-demand performance bonds exercised in connection with the termination of a large telecommunications project in Peru. See Legal Proceedings in Note 11 for additional information on this matter.
A reconciliation of cash, cash equivalents, and restricted cash reported within the condensed consolidated balance sheets that sum to the total of such amounts shown in the statements of cash flows is as follows (in thousands):
 
 
June 30,
 
 
2019
 
2018
Cash and cash equivalents
 
$
73,356

 
$
120,357

Restricted cash included in “Prepaid expenses and other current assets”
 
3,733

 
2,926

Restricted cash included in “Other assets, net”
 
1,028

 
1,454

Total cash, cash equivalents, and restricted cash reported in the statements of cash flows
 
$
78,117

 
$
124,737

 
 
March 31,
 
 
2019
 
2018
Cash and cash equivalents
 
$
85,423

 
$
101,736

Restricted cash included in “Prepaid expenses and other current assets”
 
3,038

 
3,160

Restricted cash included in “Other assets, net”
 
1,031

 
384

Total cash, cash equivalents, and restricted cash reported in the statements of cash flows
 
$
89,492

 
$
105,280

 
 
December 31,
 
 
2018
 
2017
Cash and cash equivalents
 
$
78,687

 
$
138,285

Restricted cash included in “Prepaid expenses and other current assets”
 
3,286

 
5,106

Restricted cash included in “Other assets, net”
 
1,283

 
384

Total cash, cash equivalents, and restricted cash reported in the statements of cash flows
 
$
83,256

 
$
143,775


Restricted cash includes any cash that is legally restricted as to withdrawal or usage.
Supplemental cash flow information related to leases is as follows (in thousands):
 
 
Three Months Ended
 
Six Months Ended
 
 
June 30, 2019
 
June 30, 2019
Cash paid for amounts included in the measurement of lease liabilities:
 
 
 
 
Operating cash flows from operating leases
 
$
(29,820
)
 
$
(59,267
)
Operating cash flows from finance leases
 
$
(17
)
 
$
(38
)
Financing cash flows from finance leases
 
$
(482
)
 
$
(1,112
)
Lease assets obtained in exchange for lease liabilities:
 
 
 
 
Operating leases
 
$
27,467

 
$
43,406

Finance leases
 
$
220

 
$
621


Additional supplemental cash flow information is as follows (in thousands):
 
 
Three Months Ended
 
Six Months Ended
 
 
June 30,
 
June 30,
 
 
2019
 
2018
 
2019
 
2018
Cash (paid) received during the period for —
 
 
 
 
 
 
 
 
Interest paid
 
$
(15,725
)
 
$
(8,772
)
 
$
(29,157
)
 
$
(14,732
)
Income taxes paid
 
$
(60,333
)
 
$
(34,598
)
 
$
(68,526
)
 
$
(52,555
)
Income tax refunds
 
$
50

 
$
1,345

 
$
1,328

 
$
2,363