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Supplemental Cash Flow Information
 12 Months Ended
Dec. 31, 2015
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,
 
2015
 
2014
 
2013
Decrease (increase) in restricted cash
$
6,764

 
$
(2,045
)
 
$
29,467

Decrease (increase) in accounts receivable
9,051

 
(32,602
)
 
11,172

Decrease (increase) in receivable from affiliates
10,905

 
50,454

 
(61,095
)
Decrease (increase) in inventories
(31,043
)
 
(6,243
)
 
(11,352
)
Decrease (increase) in derivatives and margin deposits
(2,109
)
 
28

 
1,012

Decrease (increase) in other current assets
(413
)
 
(614
)
 
9,361

Decrease (increase) in other assets
4,015

 
2

 
137

Increase (decrease) in accounts payable and accrued liabilities
2,513

 
11,461

 
31,030

Increase (decrease) in payable to affiliates
(8,427
)
 
(48,819
)
 
62,279

Increase (decrease) in payables to pre-petition creditors
(3,837
)
 
(54
)
 
(29,609
)
Increase (decrease) in other noncurrent liabilities
(2,625
)
 
5,067

 
(2,541
)
 
$
(15,206
)
 
$
(23,365
)
 
$
39,861


Non-cash transactions
During the years ended December 31, 2015, 2014 and 2013, we recorded reductions of $51.5 million, $85.2 million and $180.2 million, respectively, to noncontrolling interests in consolidated subsidiaries and offsetting increases to additional paid-in capital of $30.7 million, $53.2 million and $112.9 million, respectively, (net of tax impacts of $20.8 million, $31.9 million and $67.3 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 years ended December 31, 2014 and 2013, we issued 904,231 and 425,618 shares of Class A common stock, respectively, related to the exercise of warrants. These issuances resulted in the non-cash reclassifications for the years ended December 31, 2014 and 2013 of $73.0 million and $21.4 million, respectively, from other noncurrent liabilities to common stock and additional paid-in capital. Cash proceeds of $1.5 million and $0.2 million were received in connection with the warrant exercises for the years ended December 31, 2014 and 2013, respectively. Outstanding warrants expired in 2014.
See Note 16 for discussion of non-cash change to ARO liability for the year ended December 31, 2015.
Other supplemental disclosures
We paid cash for interest totaling $64.9 million, $36.7 million and $23.9 million for the years ended December 31, 2015, 2014 and 2013, respectively.
We paid cash for income taxes (net of refunds received) in the amount of $7.3 million, $23.5 million and $13.9 million during the years ended December 31, 2015, 2014 and 2013, respectively.
We accrued $11.8 million, $7.0 million and $10.1 million at December 31, 2015, 2014 and 2013, respectively, for purchases of property, plant and equipment.
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.