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Supplemental Cash Flow Information
 12 Months Ended
Dec. 31, 2017
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,
 
2017
 
2016
 
2015
Decrease (increase) in restricted cash
$
(1
)
 
$
(1
)
 
$
6,764

Decrease (increase) in accounts receivable
(237,394
)
 
(90,810
)
 
9,051

Decrease (increase) in receivable from affiliates
23,764

 
(19,541
)
 
10,905

Decrease (increase) in inventories
(17,862
)
 
(30,686
)
 
(31,043
)
Decrease (increase) in other current assets
2,947

 
634

 
(508
)
Decrease (increase) in other assets
(14,307
)
 
(297
)
 
4,015

Increase (decrease) in accounts payable and accrued liabilities
209,982

 
94,687

 
2,513

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

 
(8,427
)
Increase (decrease) in payables to pre-petition creditors
—

 
—

 
(3,837
)
Increase (decrease) in other noncurrent liabilities
19,385

 
2,573

 
(2,625
)
 
$
(33,023
)
 
$
(21,966
)
 
$
(13,192
)

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.
On February 13, 2015, we contributed Wattenburg Oil Trunkline and Glass Mountain Holding, LLC, which held our 50% interest in Glass Mountain, to Rose Rock. As the acquisition was between parties under common control, Rose Rock recorded its interest in acquired assets and liabilities at SemGroup's historical value and SemGroup did not recognize a gain on the transaction. We recorded a reduction of $51.5 million to noncontrolling interests in consolidated subsidiaries and an offsetting increase to additional paid-in capital of $30.7 million, net of a tax impact of $20.8 million. These non-cash entries represent the portion of proceeds in excess of historical cost which were attributed to Rose Rock's third-party unitholders related to Rose Rock's common control acquisition from SemGroup.
See Note 15 for discussion of non-cash change to our asset retirement obligation liability for the year ended December 31, 2015.
Other supplemental disclosures
We paid cash for interest totaling $82.0 million, $71.3 million and $64.9 million for the years ended December 31, 2017, 2016 and 2015, respectively.
We paid cash for income taxes (net of refunds received) in the amount of $7.2 million, $0.7 million and $7.3 million during the years ended December 31, 2017, 2016 and 2015, respectively.
We accrued $76.1 million, $1.4 million and $11.8 million at December 31, 2017, 2016 and 2015, respectively, for purchases of property, plant and equipment.
We financed prepayments of insurance premiums of $6.2 million, $4.7 million and $4.6 million for the years ended December 31, 2017, 2016 and 2015, respectively.