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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Operating activties    
Net loss $ (382,589) $ (281,298)
Adjustments to reconcile net loss to cash used in operating activities:    
Depreciation, depletion and amortization 122,158 202,246
Amortization of acquired sales contracts, net (832) (5,034)
Amortization relating to financing activities 7,657 12,539
Prepaid royalties expensed 1,770 3,939
Employee stock-based compensation expense 1,435 3,354
Asset impairment and non-cash mine closure costs 119,194 17,242
Non-cash bankruptcy reorganization items (14,892) 0
Expenses related to proposed debt restructuring 2,213 4,016
Gains on disposals and divestitures, net (6,269) (1,325)
Deferred income taxes (418) (7,510)
Changes in:    
Receivables (7,776) 12,433
Inventories 21,152 (33,743)
Accounts payable, accrued expenses and other current liabilities 84,160 (56,419)
Income taxes, net (937) (37)
Other (6,278) 4,022
Cash used in operating activities (60,252) (125,575)
Investing activities    
Capital expenditures (74,137) (99,361)
Additions to prepaid royalties (217) (409)
Proceeds from (consideration paid for) disposals and divestitures (3,303) 991
Purchases of marketable securities (98,750) (161,336)
Proceeds from sale or maturity of marketable securities and other investments 94,589 157,729
Investments in and advances to affiliates (2,890) (5,138)
Deposits of restricted cash (4,695) (37,885)
Cash used in investing activities (89,403) (145,409)
Financing activities    
Payments on term loan 0 (9,750)
Net payments on other debt (10,293) (9,826)
Expenses related to proposed debt restructuring (2,213) (4,016)
Debt financing costs (18,806) 0
Cash used in financing activities (31,312) (23,592)
Decrease in cash and cash equivalents (180,967) (294,576)
Cash and cash equivalents, beginning of period 450,781 734,231
Cash and cash equivalents, end of period $ 269,814 $ 439,655