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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Cash flows from continuing operating activities    
Net income (loss) $ (26,697) $ 18,977
Adjustments to reconcile net income (loss) to net cash provided by continuing operating activities:    
Deferred income taxes (13,127) 11,542
Gains on property insurance recoveries associated with property, plant and equipment   (5,147)
Impairment of natural gas properties 39,670  
Depreciation, depletion and amortization of property, plant and equipment 29,951 26,421
Other 3,527 2,461
Cash provided (used) by changes in assets and liabilities (net of effects of discontinued operations):    
Accounts receivable 5,156 (7,326)
Inventories 1,849 (917)
Prepaid insurance 11,141 11,619
Prepaid and accrued income taxes (1,322) 5,593
Other supplies, prepaid items and other (3,872) 1,454
Accounts payable 5,043 5,160
Accrued interest (8,202) (8,131)
Other current and noncurrent liabilities (614) (4,807)
Net cash provided by continuing operating activities 42,503 56,899
Cash flows from continuing investing activities    
Expenditures for property, plant and equipment (300,763) (164,160)
Proceeds from property insurance recovery associated with property, plant and equipment   5,147
Proceeds from sales of property and equipment 3 220
Proceeds from short-term investments 24,500  
Purchases of short-term investments (25,000) (14,500)
Proceeds from noncurrent restricted cash and cash equivalents 45,969 169,276
Deposits of noncurrent restricted cash and cash equivalents   (165,106)
Proceeds from noncurrent restricted investments 25,000 209,990
Purchase of noncurrent restricted investments   (50,000)
Other investing activities (1,445) (1,814)
Net cash used by continuing investing activities (231,736) (10,947)
Cash flows from continuing financing activities    
Proceeds from revolving debt facility 15,101  
Payments on revolving debt facility (1,800)  
Proceeds from long-term debt, net of fees 31,047  
Payments on long-term debt (9,064) (7,853)
Payments of debt issuance costs (121)  
Payments on short-term financing (10,751) (12,236)
Proceeds from exercises of stock options 1,785 649
Excess income tax benefit associated with stock-based compensation 596  
Dividends paid on preferred stocks (300) (300)
Net cash provided (used) by continuing financing activities 26,493 (19,740)
Cash flows of discontinued operations:    
Operating cash flows (113) (138)
Net increase (decrease) in cash and cash equivalents (162,853) 26,074
Cash and cash equivalents at beginning of period 186,811 143,750
Cash and cash equivalents at end of period $ 23,958 $ 169,824