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Schedule II - Consolidated Valuation and Qualifying Accounts (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Allowance For Doubtful Accounts And Sales Allowances [Member]
      
Valuation and Qualifying Accounts Roll Forward]      
Balance at beginning of year $ 15,976 $ 10,636 $ 10,349
Additions charged to costs and expenses 1,350 4,573 2,816
Deductions (2,992) (2,403) (2,842)
Other changes 658 3,170 313
Balance at end of year 14,992 15,976 10,636
Reserve for inventory obsolescence [Member]
      
Valuation and Qualifying Accounts Roll Forward]      
Balance at beginning of year 41,967 35,224 32,516
Additions charged to costs and expenses 11,360 14,736 11,407
Deductions (9,696) (8,253) (8,848)
Other changes (179) 260 149
Balance at end of year $ 43,452 $ 41,967 $ 35,224