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Supplemental Cash Flow Information
 12 Months Ended
Dec. 31, 2016
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,
 
2016
 
2015
 
2014
Decrease (increase) in restricted cash
$
(1
)
 
$
6,764

 
$
(2,045
)
Decrease (increase) in accounts receivable
(90,810
)
 
9,051

 
(32,602
)
Decrease (increase) in receivable from affiliates
(19,541
)
 
10,905

 
50,454

Decrease (increase) in inventories
(30,686
)
 
(31,043
)
 
(6,243
)
Decrease (increase) in margin deposits
(711
)
 
(2,109
)
 
28

Decrease (increase) in other current assets
356

 
(413
)
 
(614
)
Decrease (increase) in other assets
(297
)
 
4,015

 
2

Increase (decrease) in accounts payable and accrued liabilities
94,687

 
2,513

 
11,461

Increase (decrease) in payable to affiliates
21,475

 
(8,427
)
 
(48,819
)
Increase (decrease) in payables to pre-petition creditors
—

 
(3,837
)
 
(54
)
Increase (decrease) in other noncurrent liabilities
2,573

 
(2,625
)
 
5,067

 
$
(22,955
)
 
$
(15,206
)
 
$
(23,365
)

Non-cash transactions
During the years ended December 31, 2015 and 2014, we recorded reductions of $51.5 million and $85.2 million, respectively, to noncontrolling interests in consolidated subsidiaries and offsetting increases to additional paid-in capital of $30.7 million and $53.2 million, respectively, (net of tax impacts of $20.8 million and $31.9 million, respectively). 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 acquisitions from SemGroup (Note 4).
During the year ended December 31, 2014, we issued 904,231 shares of Class A common stock related to the exercise of warrants. These issuances resulted in the non-cash reclassification of $73.0 million from other noncurrent liabilities to common stock and additional paid-in capital for the year ended December 31, 2014. Cash proceeds of $1.5 million were received in connection with the warrant exercises for the year ended December 31, 2014. Outstanding warrants expired in 2014.
See Note 16 for discussion of non-cash change to our asset retirement obligation liability for the years ended December 31, 2016, 2015 and 2014.
In connection with our acquisition of the noncontrolling interest in Rose Rock, as discussed in Note 4, 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 $71.3 million, $64.9 million and $36.7 million for the years ended December 31, 2016, 2015 and 2014, respectively.
We paid cash for income taxes (net of refunds received) in the amount of $0.7 million, $7.3 million and $23.5 million during the years ended December 31, 2016, 2015 and 2014, respectively.
We accrued $1.4 million, $11.8 million and $7.0 million at December 31, 2016, 2015 and 2014, respectively, for purchases of property, plant and equipment.
We financed prepayments of insurance premiums of $4.7 million, $4.6 million and $4.4 million for the years ended December 31, 2016, 2015 and 2014, respectively.
We sold common units of NGL Energy for proceeds of $88.8 million during the year ended December 31, 2014 (Note 5), of which only $79.7 million of proceeds from the sales had been received at December 31, 2014. We recorded an accrual for the proceeds that had not been received at December 31, 2014.