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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Cash flows from continuing operating activities      
Net income $ 54,962 $ 58,604 $ 83,842
Adjustments to reconcile net income to net cash provided by continuing operating activities:      
Net loss from discontinued operations 179 182 142
Deferred income taxes 35,289 245 8,688
Gains on property insurance recoveries associated with property, plant and equipment (66,255)    
Depreciation, depletion and amortization of property, plant and equipment 28,310 20,681 18,762
Other 4,819 4,614 6,127
Cash provided (used) by changes in assets and liabilities (net of effects of discontinued operations):      
Accounts receivable 2,268 7,935 (13,451)
Inventories 8,203 (6,607) 60
Prepaid and accrued income taxes (13,278) 11,013 (12,805)
Other supplies, prepaid items and other (10,048) (2,243) (7,994)
Accounts payable (6,032) 980 2,175
Accrued interest 13,356 (6) (768)
Other current and noncurrent liabilities 2,282 4,073 5,193
Net cash provided by continuing operating activities 54,055 99,471 89,971
Cash flows from continuing investing activities      
Expenditures for property, plant and equipment (157,377) (92,644) (44,221)
Acquisition of working interests in natural gas properties (9,205) (50,219)  
Proceeds from property insurance recovery associated with property, plant and equipment 66,437 11,415  
Proceeds from sales of property and equipment 1,459 307 112
Purchases of short-term investments   (10,032) (10,014)
Proceeds from short-term investments   20,037 10,012
Deposits of current and noncurrent restricted cash (80,943)    
Purchase of noncurrent restricted investments (209,990)    
Proceeds from sales of carbon credits   761 2,597
Payments on contractual obligations-carbon credits   (786) (2,266)
Other assets (4) (508) (816)
Net cash used by continuing investing activities (389,623) (121,669) (44,596)
Cash flows from continuing financing activities      
Proceeds from senior secured notes, net of pay off of secured term loan and fees 350,957    
Proceeds from other long-term debt, net of fees 39,825    
Payments on other long-term debt (12,647) (7,019) (15,345)
Payments of debt issuance costs (1,872) (88) (112)
Proceeds from short-term financing 16,385 11,192 6,775
Payments on short-term financing (11,890) (7,584) (4,950)
Proceeds from revolving debt facility   209,238 669,739
Payments on revolving debt facility   (209,238) (669,739)
Proceeds from secured term loan, net of fees     14,766
Proceeds from modification of secured term loan, net of fees     10,347
Payments associated with induced conversion of 5.5% convertible debentures     (558)
Payments on loans secured by cash value of life insurance policies   (1,918) (84)
Proceeds from exercises of stock options 1,014 767 1,197
Excess income tax benefit associated with stock-based compensation   498 1,160
Acquisition of redeemable preferred stock   (39)  
Dividends paid on preferred stocks (300) (300) (305)
Net cash provided (used) by continuing financing activities 381,472 (4,491) 12,891
Cash flows of discontinued operations:      
Operating cash flows (174) (220) (283)
Net increase (decrease) in cash and cash equivalents 45,730 (26,909) 57,983
Cash and cash equivalents at beginning of year 98,020 124,929 66,946
Cash and cash equivalents at end of year $ 143,750 $ 98,020 $ 124,929