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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Cash flows from continuing operating activities    
Net income (loss) $ 133,701 $ (26,697)
Adjustments to reconcile net income (loss) to net cash provided (used) by continuing operating activities:    
Income from discontinued operations, net of taxes (196,644) (8,361)
Deferred income taxes (31,128) (20,554)
Impairment of natural gas properties   39,670
Depreciation, depletion and amortization of property, plant and equipment 41,480 26,483
Other 7,605 2,588
Cash provided (used) by changes in assets and liabilities (net of effects of discontinued operations):    
Accounts receivable 9,428 10,673
Inventories 12,499 (1,584)
Prepaid insurance 7,241 9,956
Prepaid and accrued income taxes 298 (1,322)
Other supplies, prepaid items and other 624 (3,943)
Accounts payable 16,005 2,328
Accrued interest (7,679) (8,202)
Other current and noncurrent liabilities 5,746 (1,816)
Net cash provided (used) by continuing operating activities (824) 19,219
Cash flows from continuing investing activities    
Expenditures for property, plant and equipment (202,187) (300,035)
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 45,969
Proceeds from short-term investments   24,500
Purchases of short-term investments   (25,000)
Proceeds from noncurrent restricted investments   25,000
Other investing activities 3,488 156
Net cash provided (used) by continuing investing activities 43,734 (229,410)
Cash flows from continuing financing activities    
Proceeds from revolving debt facility 76,516 15,101
Payments on revolving debt facility (76,516) (1,800)
Proceeds from other long-term debt, net of fees 14,751 31,047
Payments on other long-term debt (11,653) (8,615)
Payments of debt modification and issuance costs (5,949) (121)
Payments of issuance costs relating to preferred stocks and warrants (785)  
Payments on short-term financing (7,530) (9,509)
Proceeds from exercises of stock options 371 1,785
Excess income tax benefit associated with stock-based compensation   330
Redemption of preferred stock (71,966)  
Dividends paid on preferred stocks (8,028) (300)
Net cash provided (used) by continuing financing activities (90,789) 27,918
Cash flows of discontinued operations:    
Net cash provided (used) by operating activities (439) 24,992
Net cash used by investing activities (1,025) (2,406)
Net cash used by financing activities (1,842) (1,425)
Net cash provided (used) by discontinued operations (3,306) 21,161
Net decrease in cash and cash equivalents (51,185) (161,112)
Cash and cash equivalents at beginning of period 127,195 184,996
Cash and cash equivalents at end of period $ 76,010 $ 23,884