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Condensed Consolidating Financial Information - Condensed Consolidating Statements of Cash Flows (Debtor-in-Possession) (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash (used in) provided by operating activities $ (139,041) $ 318,994
Cash flows from investing activities    
Capital expenditures for property, plant and equipment (126,245) (636,822)
Proceeds from sale of assets 16,734 11,462
Other 15,337 7,987
Net cash used in investing activities (110,908) (628,835)
Cash flows from financing activities    
Proceeds from borrowings 488,900 2,190,000
Repayments of borrowings (40,000) (940,000)
Distribution to unitholders 0 (84,690)
Intercompany (advances) borrowings, net 0 0
Other (40,373) (53,105)
Net cash provided by financing activities 448,527 1,112,205
Net increase (decrease) in cash and cash equivalents 198,578 802,364
CASH AND CASH EQUIVALENTS, beginning of year 435,588 181,253
CASH AND CASH EQUIVALENTS, end of period 634,166 983,617
Guarantors    
Cash flows from financing activities    
Impact of excluding noncontrolling interest distributions from other investing activities   84,700
Impact of excluding noncontrolling interest distributions from other financing activities   (84,700)
Reportable Legal Entities | Parent    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash (used in) provided by operating activities (129,888) (122,182)
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 488,900 2,190,000
Repayments of borrowings   (940,000)
Distribution to unitholders   0
Intercompany (advances) borrowings, net (107,701) (275,066)
Other (40,373) (53,105)
Net cash provided by financing activities 340,826 921,829
Net increase (decrease) in cash and cash equivalents 210,938 799,647
CASH AND CASH EQUIVALENTS, beginning of year 426,917 170,468
CASH AND CASH EQUIVALENTS, end of period 637,855 970,115
Reportable Legal Entities | Guarantors    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash (used in) provided by operating activities (4,589) 344,779
Cash flows from investing activities    
Capital expenditures for property, plant and equipment (126,245) (636,822)
Other 18,695 18,701
Net cash used in investing activities (107,550) (618,121)
Cash flows from financing activities    
Proceeds from borrowings 0 0
Repayments of borrowings   0
Distribution to unitholders   0
Intercompany (advances) borrowings, net 111,292 276,384
Other 0 0
Net cash provided by financing activities 111,292 276,384
Net increase (decrease) in cash and cash equivalents (847) 3,042
CASH AND CASH EQUIVALENTS, beginning of year 847 1,398
CASH AND CASH EQUIVALENTS, end of period 0 4,440
Reportable Legal Entities | Non-Guarantors    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash (used in) provided by operating activities 1,098 65,902
Cash flows from investing activities    
Capital expenditures for property, plant and equipment 0 0
Other 2,980 5
Net cash used in investing activities 2,980 5
Cash flows from financing activities    
Proceeds from borrowings 0 0
Repayments of borrowings   0
Distribution to unitholders   (97,498)
Intercompany (advances) borrowings, net (3,591) (1,318)
Other (6,338) 32,584
Net cash provided by financing activities (9,929) (66,232)
Net increase (decrease) in cash and cash equivalents (5,851) (325)
CASH AND CASH EQUIVALENTS, beginning of year 7,824 9,387
CASH AND CASH EQUIVALENTS, end of period 1,973 9,062
Eliminations    
Condensed Cash Flow Statements, Captions [Line Items]    
Net cash (used in) provided by operating activities (5,662) 30,495
Cash flows from investing activities    
Capital expenditures for property, plant and equipment 0 0
Other (6,338) (10,719)
Net cash used in investing activities (6,338) (10,719)
Cash flows from financing activities    
Proceeds from borrowings 0 0
Repayments of borrowings   0
Distribution to unitholders   12,808
Intercompany (advances) borrowings, net 0 0
Other 6,338 (32,584)
Net cash provided by financing activities 6,338 (19,776)
Net increase (decrease) in cash and cash equivalents (5,662) 0
CASH AND CASH EQUIVALENTS, beginning of year 0 0
CASH AND CASH EQUIVALENTS, end of period $ (5,662) 0
Impact of excluding noncontrolling interest distributions from other investing activities   (84,700)
Impact of excluding noncontrolling interest distributions from other financing activities   $ 84,700