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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Cash flows from continuing operating activities    
Net income (loss) $ (68) $ 14,303
Adjustments to reconcile net income (loss) to net cash provided (used) by continuing operating activities:    
Net loss from discontinued operations    21
Deferred income taxes 340 1,337
Losses on sales and disposals of property and equipment 50 15
Depreciation, depletion and amortization of property, plant and equipment 6,550 5,018
Amortization of other assets 87 87
Stock-based compensation 414 415
Provisions for losses on accounts receivable 100 40
Provision for (realization of) losses on inventory (284) 5
Provision for (realization of) losses on firm sales commitments (210) 2,984
Provision for impairment on long-lived assets 210   
Equity in earnings of affiliate (171) (171)
Distributions received from affiliate 429 429
Changes in fair value of commodities contracts 162 (142)
Changes in fair value of interest rate contracts (168) (270)
Cash provided (used) by changes in assets and liabilities (net of effects of discontinued operations):    
Accounts receivable (9,796) (215)
Inventories (5,368) (9,123)
Prepaid and accrued income taxes (10,909) 1,686
Other supplies, prepaid items and other 2,212 1,174
Accounts payable (4,695) (5,628)
Accrued payroll and benefits (1,068) (1,122)
Customer deposits (1,164) 474
Other current and noncurrent liabilities (1,896) (202)
Deferred gain on insurance recoveries 5,122   
Net cash provided (used) by continuing operating activities (20,121) 11,115
Cash flows from continuing investing activities    
Capital expenditures (44,344) (15,632)
Proceeds from property insurance recovery associated with property, plant and equipment 4,495   
Proceeds from sales of property and equipment 199 266
Proceeds from short-term investments    4
Purchase of short-term investments    (4)
Deposits of restricted cash (82)   
Payments on contractual obligations-carbon credits    (180)
Other assets (109) (99)
Net cash used by continuing investing activities (39,841) (15,645)
Cash flows from continuing financing activities    
Proceeds from revolving debt facility    161,506
Payments on revolving debt facility    (161,506)
Proceeds from other long-term debt, net of fees 34,825   
Payments on other long-term debt (1,738) (3,439)
Payments on loans secured by cash value of life insurance policies    (1,918)
Payments on short-term financing (2,782) (1,684)
Proceeds from exercise of stock options 249 173
Excess income tax benefit associated with stock-based compensation 110 186
Acquisition of redeemable preferred stock    (39)
Dividends paid on preferred stocks    (300)
Net cash provided (used) by continuing financing activities 30,664 (7,021)
Cash flows of discontinued operations:    
Operating cash flows (52) (36)
Net decrease in cash and cash equivalents (29,350) (11,587)
Cash and cash equivalents at beginning of period 98,020 124,929
Cash and cash equivalents at end of period 68,670 113,342
Supplemental cash flow information:    
Cash payments for income taxes, net of refunds 9,715 4,581
Noncash investing and financing activities:    
Other assets, accounts payable and long-term debt associated with additions of property, plant and equipment $ 20,510 $ 3,208