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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Cash flows from continuing operating activities    
Net income (loss) $ (30,131) $ 133,701
Adjustments to reconcile net income (loss) to net cash provided (used) by continuing operating activities:    
Income from discontinued operations, net of taxes   (196,644)
Deferred income taxes (10,702) (31,128)
Loss on sales of a business and other property and equipment 4,366 673
Depreciation, depletion and amortization of property, plant and equipment 50,341 41,480
Other 5,450 6,932
Cash provided (used) by changes in assets and liabilities (net of effects of discontinued operations):    
Accounts receivable 1,687 9,428
Inventories 3,282 12,499
Prepaid insurance 9,611 7,241
Prepaid and accrued income taxes (1,009) 298
Other supplies, prepaid items and other (2,672) 624
Accounts payable (3,580) 16,005
Accrued interest (7,977) (7,679)
Other current and noncurrent liabilities 663 5,746
Net cash provided (used) by continuing operating activities 19,329 (824)
Cash flows from continuing investing activities    
Expenditures for property, plant and equipment (25,172) (202,187)
Net proceeds from sale (including an advance on a potential sale) of businesses and other property and equipment 22,561 90
Net proceeds from sale of discontinued operations   349,373
Deposits of restricted cash   (186,935)
Proceeds from current and noncurrent restricted cash and cash equivalents   79,995
Other investing activities 415 3,398
Net cash provided (used) by continuing investing activities (2,196) 43,734
Cash flows from continuing financing activities    
Proceeds from revolving debt facility   76,516
Payments on revolving debt facility   (76,516)
Proceeds from other long-term debt, net of fees   14,751
Payments on other long-term debt (12,413) (11,653)
Payments of debt modification and issuance costs (90) (5,949)
Payments of issuance costs relating to preferred stocks and warrants   (785)
Payments on short-term financing (9,145) (7,530)
Proceeds from exercises of stock options   371
Redemption of preferred stock   (71,966)
Dividends paid on preferred stocks   (8,028)
Other financing activities (66)  
Net cash used by continuing financing activities (21,714) (90,789)
Cash flows of discontinued operations:    
Net cash used by operating activities (2,171) (439)
Net cash used by investing activities   (1,025)
Net cash used by financing activities (200) (1,842)
Net cash used by discontinued operations (2,371) (3,306)
Net decrease in cash and cash equivalents (6,952) (51,185)
Cash and cash equivalents at beginning of period 60,017 127,195
Cash and cash equivalents at end of period $ 53,065 $ 76,010