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Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Assets    
Cash and cash equivalents $ 70,816 $ 68,939
Accounts and other receivables, net of allowance for doubtful accounts and sales returns of $3,367 in 2012 and $3,539 in 2011 105,166 98,027
Income taxes recoverable   2,592
Inventories 63,836 61,290
Deferred income taxes 6,987 7,135
Prepaid expenses and other 8,052 7,880
Total current assets 254,857 245,863
Property, plant and equipment, at cost 757,827 745,762
Less accumulated depreciation 503,180 488,488
Net property, plant and equipment 254,647 257,274
Goodwill and other intangibles 224,325 223,432
Other assets and deferred charges 58,548 54,041
Total assets 792,377 780,610
Liabilities and Shareholders' Equity    
Accounts payable 78,343 73,742
Accrued expenses 41,237 41,997
Income taxpayable 291  
Total current liabilities 119,871 115,739
Long-term debt 122,000 125,000
Deferred income taxes 72,661 70,754
Other noncurrent liabilities 71,800 72,210
Total liabilities 386,332 383,703
Commitments and contingencies (Notes 1, 3 and 12)      
Shareholders' equity:    
Common stock, no par value (issued and outstanding - 32,120,836 at March 31, 2012 and 32,057,281 at December 31, 2011) 14,867 14,357
Common stock held in trust for savings restoration plan (1,346) (1,343)
Foreign currency translation adjustment 16,666 11,693
Gain on derivative financial instruments 65 (406)
Pension and other postretirement benefit adjustments (89,041) (90,672)
Retained earnings 464,834 463,278
Total shareholders' equity 406,045 396,907
Total liabilities and shareholders' equity $ 792,377 $ 780,610