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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Cash flows from continuing operating activities    
Net income $ 7,359 $ 40,336
Adjustments to reconcile net income to net cash provided by continuing operating activities:    
Net loss from discontinued operations 59 118
Deferred income taxes 2,541 2,539
Depreciation, depletion and amortization of property, plant and equipment 13,060 10,079
Other 1,369 2,213
Cash provided (used) by changes in assets and liabilities (net of effects of discontinued operations):    
Accounts receivable (13,696) 2,305
Inventories 6,015 1,262
Prepaid and accrued income taxes (10,853) 7,375
Other supplies, prepaid items and other 5,646 3,087
Accounts payable (5,393) (10,476)
Customer deposits (6,529) (3,162)
Other current and noncurrent liabilities 615 846
Deferred gain on insurance recoveries 6,685  
Net cash provided by continuing operating activities 6,878 56,522
Cash flows from continuing investing activities    
Capital expenditures (82,608) (32,455)
Proceeds from property insurance recovery associated with property, plant and equipment 14,022  
Proceeds from sales of property and equipment 1,224 203
Proceeds from short-term investments   10,022
Purchase of short-term investments   (10,021)
Deposits of restricted cash (749) (208)
Payments on contractual obligations-carbon credits   (180)
Other assets (812) (221)
Net cash used by continuing investing activities (68,923) (32,860)
Cash flows from continuing financing activities    
Proceeds from other long-term debt, net of fees 39,825  
Payments on other long-term debt (4,661) (4,645)
Payments of debt issuance costs   (88)
Payments on short-term financing (5,577) (3,376)
Proceeds from revolving debt facility   209,238
Payments on revolving debt facility   (209,238)
Payments on loans secured by cash value of life insurance policies   (1,918)
Proceeds from exercise of stock options 304 333
Excess income tax benefit associated with stock-based compensation 110 223
Acquisition of redeemable preferred stock   (39)
Dividends paid on preferred stocks (300) (300)
Net cash provided (used) by continuing financing activities 29,701 (9,810)
Cash flows of discontinued operations:    
Operating cash flows (104) (82)
Net increase (decrease) in cash and cash equivalents (32,448) 13,770
Cash and cash equivalents at beginning of period 98,020 124,929
Cash and cash equivalents at end of period 65,572 138,699
Supplemental cash flow information:    
Cash payments for income taxes, net of refunds 11,865 13,057
Noncash investing and financing activities:    
Insurance claims receivable associated with property, plant and equipment 250 10,364
Other assets, accounts payable and long-term debt associated with additions of property, plant and equipment $ 11,486 $ 9,418