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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:      
Income from discontinued operations, including taxes (11,381) (14,547) (19,362)
Deferred income taxes (27,436) 5,376 24,070
Gains on property insurance recoveries associated with property, plant and equipment   (5,147) (66,246)
Impairment of long-lived assets 43,188    
Depreciation, depletion and amortization of property, plant and equipment 35,930 30,987 24,000
Other 4,552 4,000 3,130
Cash provided (used) by changes in assets and liabilities (net of effects of discontinued operations):      
Accounts receivable 3,677 (8,218) 3,225
Inventories (468) (993) 9,148
Prepaid insurance 2,500 1,697 (5,037)
Prepaid and accrued income taxes 576 3,505 (13,278)
Other supplies, prepaid items and other (3,717) (20) (4,905)
Accounts payable (10,825) 1,154 (3,654)
Accrued interest (709) (37) 13,356
Customer deposits (3,433) 236 (2,637)
Other current and noncurrent liabilities (2,799) 1,033 1,504
Net cash provided (used) by continuing operating activities (5,110) 38,660 18,276
Cash flows from continuing investing activities      
Expenditures for property, plant and equipment (438,944) (217,485) (152,222)
Acquisition of working interests in natural gas properties     (9,205)
Proceeds from property insurance recovery associated with property, plant and equipment   5,147 66,247
Software and software development costs (423) (2,801)  
Proceeds from sales of property and equipment 87 569 662
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 3,132 25 962
Net cash used by continuing investing activities (350,679) (9,415) (384,489)
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 (12,923) (10,439) (8,678)
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 10,273 12,965 15,242
Payments on short-term financing (12,399) (14,996) (10,755)
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 330    
Dividends paid on convertible preferred stocks (300) (300) (300)
Net cash provided (used) by continuing financing activities 264,349 (11,696) 385,433
Cash flows of discontinued operations:      
Net cash provided by operating activities 38,313 26,377 35,424
Net cash used by investing activities (3,382) (2,442) (5,105)
Net cash used by financing activities (1,292) 206 (3,957)
Net cash provided by discontinued operations 33,639 24,141 26,362
Net increase (decrease) in cash and cash equivalents (57,801) 41,690 45,582
Cash and cash equivalents at beginning of year 184,996 143,306 97,724
Cash and cash equivalents at end of year 127,195 $ 184,996 143,306
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