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Condensed Consolidating Financial Information - Cash Flows (Debtor-in-Possession) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash (used in) provided by operating activities $ (64,039) $ 360,886
Cash flows from investing activities    
Capital expenditures for property, plant and equipment (186,452) (761,905)
Proceeds from sale of assets 20,090 35,387
Other 18,762 32,156
Net cash used in investing activities (167,690) (729,749)
Cash flows from financing activities    
Proceeds from borrowings 489,198 2,190,000
Repayments of borrowings (40,000) (1,034,466)
Distribution to unitholders 0 (115,301)
Intercompany (advances) borrowings, net 0 0
Other (40,377) (62,481)
Net cash provided by financing activities 448,821 977,752
Net increase (decrease) in cash and cash equivalents 217,092 608,889
CASH AND CASH EQUIVALENTS, beginning of year 435,588 181,253
CASH AND CASH EQUIVALENTS, end of period 652,680 790,142
Reportable Legal Entities | Parent    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash (used in) provided by operating activities (133,817) (211,762)
Cash flows from investing activities    
Capital expenditures for property, plant and equipment 0 0
Other 0 0
Net cash used in investing activities 0 0
Cash flows from financing activities    
Proceeds from borrowings 489,198 2,190,000
Repayments of borrowings   (1,034,466)
Distribution to unitholders   0
Intercompany (advances) borrowings, net (87,529) (270,215)
Other (40,377) (62,481)
Net cash provided by financing activities 361,292 822,838
Net increase (decrease) in cash and cash equivalents 227,475 611,076
CASH AND CASH EQUIVALENTS, beginning of year 426,917 170,468
CASH AND CASH EQUIVALENTS, end of period 654,392 781,544
Reportable Legal Entities | Guarantors    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash (used in) provided by operating activities 69,254 441,661
Cash flows from investing activities    
Capital expenditures for property, plant and equipment (186,452) (761,905)
Other 24,995 46,841
Net cash used in investing activities (161,457) (715,064)
Cash flows from financing activities    
Proceeds from borrowings 0 0
Repayments of borrowings   0
Distribution to unitholders   0
Intercompany (advances) borrowings, net 91,356 272,900
Other 0 0
Net cash provided by financing activities 91,356 272,900
Net increase (decrease) in cash and cash equivalents (847) (503)
CASH AND CASH EQUIVALENTS, beginning of year 847 1,398
CASH AND CASH EQUIVALENTS, end of period 0 895
Reportable Legal Entities | Non-Guarantors    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash (used in) provided by operating activities 4,281 90,579
Cash flows from investing activities    
Capital expenditures for property, plant and equipment 0 0
Other 2,980 6
Net cash used in investing activities 2,980 6
Cash flows from financing activities    
Proceeds from borrowings 0 0
Repayments of borrowings   0
Distribution to unitholders   (131,941)
Intercompany (advances) borrowings, net (3,827) (2,685)
Other (9,213) 42,357
Net cash provided by financing activities (13,040) (92,269)
Net increase (decrease) in cash and cash equivalents (5,779) (1,684)
CASH AND CASH EQUIVALENTS, beginning of year 7,824 9,387
CASH AND CASH EQUIVALENTS, end of period 2,045 7,703
Eliminations    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash (used in) provided by operating activities (3,757) 40,408
Cash flows from investing activities    
Capital expenditures for property, plant and equipment 0 0
Other (9,213) (14,691)
Net cash used in investing activities (9,213) (14,691)
Cash flows from financing activities    
Proceeds from borrowings 0 0
Repayments of borrowings   0
Distribution to unitholders   16,640
Intercompany (advances) borrowings, net 0 0
Other 9,213 (42,357)
Net cash provided by financing activities 9,213 (25,717)
Net increase (decrease) in cash and cash equivalents (3,757) 0
CASH AND CASH EQUIVALENTS, beginning of year 0 0
CASH AND CASH EQUIVALENTS, end of period $ (3,757) $ 0