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Supplemental Cash Flow Information
 12 Months Ended
Dec. 31, 2018
Supplemental Cash Flow Information [Abstract]  
Supplemental Cash Flow Information SUPPLEMENTAL CASH FLOW INFORMATION
Operating assets and liabilities
The following table summarizes the changes in the components of operating assets and liabilities, net of the effects of acquisitions (in thousands):
 
Year Ended December 31,
 
2018
 
2017
 
2016
Decrease (increase) in restricted cash
$
33

 
$
(1
)
 
$
(1
)
Decrease (increase) in accounts receivable
78,624

 
(237,394
)
 
(90,810
)
Decrease (increase) in receivable from affiliates
685

 
23,764

 
(19,541
)
Decrease (increase) in inventories
52,166

 
(17,862
)
 
(30,686
)
Decrease (increase) in other current assets
(3,406
)
 
2,947

 
634

Decrease (increase) in other assets
(1,636
)
 
(14,307
)
 
(297
)
Increase (decrease) in accounts payable and accrued liabilities
(78,829
)
 
209,982

 
94,687

Increase (decrease) in payable to affiliates
(3,198
)
 
(19,537
)
 
21,475

Increase (decrease) in other noncurrent liabilities
1,374

 
19,385

 
2,573

 
$
45,813

 
$
(33,023
)
 
$
(21,966
)

Non-cash transactions
In connection with our acquisition of the noncontrolling interest in Rose Rock in 2016 (Note 5), we recorded a reduction to our deferred tax liabilities and offsetting increase to additional paid-in capital of $143.3 million associated with the transaction. This non-cash adjustment represents the deferred tax impact of the difference between the book value of the noncontrolling interest acquired and the tax basis which is stepped-up to the fair market value of the consideration which included the common shares issued and the assumption of liabilities associated with the noncontrolling interest.
Other supplemental disclosures
We paid cash for interest totaling $141.2 million, $82.0 million and $71.3 million for the years ended December 31, 2018, 2017 and 2016, respectively.
We paid cash for income taxes (net of refunds received) in the amount of $16.8 million, $7.2 million and $0.7 million during the years ended December 31, 2018, 2017 and 2016, respectively.
We accrued $51.3 million, $76.1 million and $1.4 million at December 31, 2018, 2017 and 2016, respectively, for purchases of property, plant and equipment.
We financed prepayments of insurance premiums of $8.0 million, $6.2 million and $4.7 million for the years ended December 31, 2018, 2017 and 2016, respectively.