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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cash flows from continuing operating activities      
Net income (loss) $ (34,765) $ 19,634 $ 54,962
Adjustments to reconcile net income (loss) to net cash provided by continuing operating activities:      
Net loss from discontinued operations 58 89 179
Deferred income taxes (18,519) 12,839 35,289
Gains on property insurance recoveries associated with property, plant and equipment   (5,147) (66,255)
Impairment of long-lived assets 43,188    
Depreciation, depletion and amortization of property, plant and equipment 40,496 35,664 28,310
Other 5,769 5,479 4,819
Cash provided (used) by changes in assets and liabilities (net of effects of discontinued operations):      
Accounts receivable 5,571 (7,637) 2,268
Inventories 2,145 (1,394) 8,203
Prepaid insurance 3,189 1,321 (5,073)
Prepaid and accrued income taxes 576 3,505 (13,278)
Other supplies, prepaid items and other (4,339) 61 (4,975)
Accounts payable (3,895) (1,044) (6,032)
Accrued interest (709) (37) 13,356
Customer deposits (4,623) 1,333 (2,689)
Other current and noncurrent liabilities (2,533) 2,078 4,971
Net cash provided by continuing operating activities 31,609 66,744 54,055
Cash flows from continuing investing activities      
Expenditures for property, plant and equipment (439,807) (219,842) (157,377)
Acquisition of working interests in natural gas properties     (9,205)
Proceeds from property insurance recovery associated with property, plant and equipment   5,147 66,437
Software and software development costs (2,889) (3,161) (966)
Proceeds from sales of property and equipment 87 662 1,459
Proceeds from short-term investments 39,500 14,500  
Purchases of short-term investments (25,000) (29,000)  
Proceeds from noncurrent restricted cash and cash equivalents 45,969 200,111  
Deposits of current and noncurrent restricted cash and cash equivalents   (165,471) (80,943)
Proceeds from noncurrent restricted investments 25,000 259,990  
Purchases of noncurrent restricted investments   (75,000) (209,990)
Other investing activities 3,137 41 962
Net cash used by continuing investing activities (354,003) (12,023) (389,623)
Cash flows from continuing financing activities      
Proceeds from revolving debt facility 47,438    
Payments on revolving debt facility (47,438)    
Proceeds from other long-term debt, net of fees 31,047   39,825
Payments on other long-term debt (13,771) (10,473) (12,647)
Payments of debt issuance costs (1,200)   (1,872)
Proceeds from loans secured by cash value of life insurance policies 1,288    
Proceeds from short-term financing 10,943 14,346 16,385
Payments on short-term financing (13,779) (16,140) (11,890)
Proceeds from issuance of redeemable preferred stocks, net of discount and fees 180,013    
Proceeds from issuance of common stock warrants, net of discount and fees 21,018    
Payments of issuance costs relating to preferred stocks and warrants (2,472)    
Proceeds from exercises of stock options 1,785 1,074 1,014
Excess income tax benefit associated with stock-based compensation 596    
Dividends paid on convertible preferred stocks (300) (300) (300)
Net cash provided (used) by continuing financing activities 263,057 (11,493) 381,472
Cash flows of discontinued operations:      
Operating cash flows (160) (167) (174)
Net increase (decrease) in cash and cash equivalents (59,497) 43,061 45,730
Cash and cash equivalents at beginning of year 186,811 143,750 98,020
Cash and cash equivalents at end of year 127,314 $ 186,811 143,750
12% Senior Secured Notes [Member]      
Cash flows from continuing financing activities      
Proceeds from senior secured notes, net of pay off of secured term loan, discount and fees $ 47,889    
7.75% Senior Secured Notes [Member]      
Cash flows from continuing financing activities      
Proceeds from senior secured notes, net of pay off of secured term loan, discount and fees     $ 350,957