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Schedule II Valuation and Qualifying Accounts (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Allowance for Doubtful Accounts [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of year $ 4,311 $ 5,077 $ 7,319
Charged to costs and expenses 1,888 1,403 996
Charged to other accounts (91) (200) 257
Deductions (1,279) (1,969) (3,495)
Balance at end of year 4,829 4,311 5,077
Inventory Valuation Reserve [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of year 3,693 3,997 5,127
Charged to costs and expenses 4,212 3,462 2,674
Charged to other accounts (102) (263) 173
Deductions (3,630) (3,503) (3,977)
Balance at end of year 4,173 3,693 3,997
Valuation Allowance of Deferred Tax Assets [Member]
      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of year 9,170 9,131 9,303
Charged to other accounts (5,941) 39 (172)
Balance at end of year $ 3,229 $ 9,170 $ 9,131