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 operating activities:      
Net income $ 30,515 $ 4,063 $ 34,157
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Depreciation and amortization 21,056 17,999 16,430
Impairment of intangible assets 266 129  
Provisions for losses on receivables 103 48 48
Share based compensation 1,982 3,721 3,295
Deferred income taxes 3,579 2,272 4,255
Changes in assets and liabilities:      
Receivables (2,630) (494) (4,751)
Inventories (26,855) (1,766) 10,181
Prepaid expenses and other current assets (191) (616) 126
Other assets 4,092 (6,379) (3,850)
Accounts payable 1,644 (779) 761
Accrued liabilities (5,250) 11,855 (95)
Pension liability, net (2,144) (735) (748)
Other long-term liabilities 165 52 816
Net cash provided by operating activities 32,020 26,735 62,721
Cash flows from investing activities:      
Proceeds from disposition of assets 470 6,152 2,339
Land and building purchased in capital lease extinguishment (5,005)    
Capital expenditures (24,796) (25,064) (23,352)
Net cash used in investing activities (56,007) (18,731) (32,211)
Cash flows from financing activities:      
Principal payments of long-term debt (3,058) (2,994) (3,007)
Principal payments of capital lease obligation (309) (517) (474)
Debt issuance costs   (389)  
Proceeds from stock options exercised 4,009 469 2,879
Excess tax benefit of stock options exercised 1,406 34 1,699
Net cash provided by (used in) financing activities 2,048 (3,397) 1,097
Net (decrease) increase in cash and cash equivalents (21,939) 4,607 31,607
Cash and cash equivalents at beginning of year 55,998 51,391 19,784
Cash and cash equivalents at end of year 34,059 55,998 51,391
Cash paid during the year for:      
Interest 1,865 1,991 2,205
Income taxes 8,107 3,836 12,257
Disposal of Assets and Plant Closure [Member]
     
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Loss (gain) on disposition of assets 5,514    
Disposal of Assets [Member]
     
Adjustments to reconcile net income (loss) to net cash provided by operating activities:      
Loss (gain) on disposition of assets 174 (2,635) 2,096
InCon [Member]
     
Cash flows from investing activities:      
Acquisitions   181 (9,028)
Wisconsin Specialty Protein [Member]
     
Cash flows from investing activities:      
Acquisitions (26,676)    
Cyvex [Member]
     
Cash flows from investing activities:      
Acquisitions     $ (2,170)