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Supplemental Cash Flow Information (Tables)
 12 Months Ended
Dec. 31, 2018
Supplemental Cash Flow Elements [Abstract]  
Net Effect of Changes in Operating Assets and Liabilities, Net Of Non-Cash Transactions, On Cash Flows From Operating Activities of Continuing Operations The net effects of changes in operating assets and liabilities, net of non-cash transactions, on cash flows from operating activities of continuing operations are as follows (in thousands):
 
 
Year Ended December 31,
 
 
2018
 
2017
 
2016
Accounts and notes receivable
 
$
(475,919
)
 
$
(425,313
)
 
$
144,877

Contract assets
 
(92,838
)
 
15,999

 
(152,702
)
Inventories
 
(28,131
)
 
14,110

 
(9,905
)
Prepaid expenses and other current assets
 
(40,187
)
 
(32,079
)
 
25,133

Accounts payable and accrued expenses and other non-current liabilities
 
247,897

 
28,547

 
81,246

Contract liabilities
 
(23
)
 
139,114

 
(124,680
)
Other, net
 
(11,332
)
 
17,858

 
(12,635
)
Net change in operating assets and liabilities, net of non-cash transactions
 
$
(400,533
)
 
$
(241,764
)
 
$
(48,666
)
Additional Supplemental Cash Flow Information A reconciliation of cash, cash equivalents, and restricted cash reported within the consolidated balance sheets that sum to the total of such amounts shown in the statements of cash flows are as follows (in thousands).
 
 
December 31,
 
 
2018
 
2017
 
2016
 
2015
Cash and cash equivalents
 
78,687

 
138,285

 
$
112,183

 
$
128,771

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

 
5,106

 
1,709

 
—

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

 
384

 
518

 
—

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

 
$
143,775

 
$
114,410

 
$
128,771


Restricted cash includes any cash that is legally restricted as to withdrawal or usage.
Additional supplemental cash flow information is as follows (in thousands):
 
 
Year Ended December 31,
 
 
2018
 
2017
 
2016
Cash (paid) received during the period for -
 
 
 
 
 
 
Interest paid related to continuing operations
 
$
(34,935
)
 
$
(19,373
)
 
$
(12,828
)
Income taxes paid related to continuing operations
 
$
(112,895
)
 
$
(112,335
)
 
$
(121,662
)
Income taxes paid related to discontinued operations
 
$
—

 
$
—

 
$
(7,260
)
Income tax refunds related to continuing operations
 
$
5,209

 
$
9,845

 
$
7,548