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Schedule II - Consolidated Valuation and Qualifying Accounts (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Allowance For Doubtful Accounts And Sales Allowances [Member]
      
Valuation and Qualifying Accounts Roll Forward]      
Balance at beginning of year $ 10,636 $ 10,349 $ 11,187
Additions charged to costs and expenses 4,573 2,816 1,558
Deductions (2,403) (2,842) (2,900)
Other changes 3,170 313 504
Balance at end of year 15,976 10,636 10,349
Reserve for inventory obsolescence [Member]
      
Valuation and Qualifying Accounts Roll Forward]      
Balance at beginning of year 35,224 32,516 29,037
Additions charged to costs and expenses 14,736 11,407 12,905
Deductions (8,253) (8,848) (9,125)
Other changes 260 149 (301)
Balance at end of year $ 41,967 $ 35,224 $ 32,516