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Income Taxes (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Current      
Federal $ (1,661,000) $ 8,930,000 $ 7,762,000
State 1,294,000 1,096,000 (856,000)
Foreign 6,875,000 4,993,000 8,453,000
Total current 6,508,000 15,019,000 15,359,000
Deferred      
Federal (7,053,000) (41,513,000) 18,889,000
State (2,258,000) (3,922,000) 1,742,000
Foreign 3,554,000 (52,000) 573,000
Total deferred (5,757,000) (45,487,000) 21,204,000
Total tax provision (benefit) 751,000 (30,468,000) 36,563,000
Effective Income Tax Rate Reconciliation Detail [Table]      
Income tax provision (benefit) computed at statutory federal income tax rates 2,182,000 (25,827,000) 36,880,000
State income taxes (net of federal benefit) (627,000) (1,837,000) 576,000
Nondeductible expenses 1,577,000 1,654,000 1,566,000
Impact of international operations (1,229,000) (3,526,000) (1,138,000)
Excess depletion (385,000) (377,000) (124,000)
Other (767,000) (555,000) (1,197,000)
Total tax provision (benefit) 751,000 (30,468,000) 36,563,000
Undistributed earnings intended for investment 28,100,000    
Domestic and Foreign Income Before Tax Detail [Table]      
Domestic (9,167,000) (92,557,000) 82,251,000
International 15,400,000 18,764,000 23,119,000
Total 6,233,000 (73,793,000) 105,370,000
Unrecognized Tax Benefit Liability Rollforward Detail [Table]      
Gross unrecognized tax benefits at beginning of period 1,849,000 2,256,000 2,235,000
Increases in tax positions for prior years 0 0 561,000
Decreases in tax positions for prior years 0 0 0
Increases in tax positions for current year 0 0 0
Settlements 0 0 0
Lapse in statute of limitations (297,000) (407,000) (540,000)
Gross unrecognized tax benefits at end of period 1,552,000 1,849,000 2,256,000
Net reversal of previously recorded interest and penalties 300,000 200,000 500,000
Accrued potential interest and penalties 1,500,000 1,800,000  
Amount of unrecognized tax benefits that would affect effective tax rate 1,100,000 1,400,000  
Deferred tax assets:      
Accruals 53,584,000 103,507,000  
Goodwill 1,975,000 3,325,000  
All other 28,062,000 35,709,000  
Total deferred tax assets 83,621,000 142,541,000  
Valuation allowance (4,769,000) (7,121,000)  
Net deferred tax assets 78,852,000 135,420,000  
Deferred tax liabilities:      
Excess book over tax basis in property, plant, and equipment 81,501,000 144,525,000  
All other 6,225,000 7,100,000  
Total deferred tax liability 87,726,000 151,625,000  
Net deferred tax liability 8,874,000 16,205,000  
Foreign and state net operating loss carryforwards 8,300,000    
Operating loss carryforwards, expiration dates
In those countries and states in which net operating losses are subject to an expiration period, our loss carryforwards, if not utilized, will expire at various dates from 2012 through 2031.
    
Foreign tax credits $ 4,200,000    
Tax credit expiration dates
The foreign tax credits expire in varying amounts from 2015 through 2021.