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Schedule II - 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 [Member]
      
Movement in Valuation Allowances and Reserves      
Balance at beginning of period $ 4,080 $ 2,360 $ 3,008
Additions - Charged to costs and expenses 2,447 3,067 4,205
Additions - Charged to other accounts 199 [1] 930 [1] 52
Deductions (1,149) [2] (2,289) [2] (4,919) [2]
Translations (77) (12) (14)
Balance at end of period 5,654 4,080 2,360
Inventory Valuation Reserve [Member]
      
Movement in Valuation Allowances and Reserves      
Balance at beginning of period 4,078 3,191 3,181
Additions - Charged to costs and expenses 2,010 2,507 3,331
Additions - Charged to other accounts 675 1,085 [1] 0 [1]
Deductions (313) [3] (2,732) [3] (3,398) [3]
Translations (106) (27) 77
Balance at end of period 6,556 4,078 3,191
Valuation Allowance of Deferred Tax Assets [Member]
      
Movement in Valuation Allowances and Reserves      
Balance at beginning of period 1,766 1,869 758
Additions - Charged to costs and expenses 339 1,251 1,111
Additions - Charged to other accounts 0 0 0
Deductions (879) [4] (1,362) [4] 0
Translations (24) (8) 0
Balance at end of period $ 1,250 $ 1,766 $ 1,869
[1] Reserves at date of acquisition of subsidiary or subsidiaries.
[2] Reversal of amounts previously recorded as bad debt and uncollectible accounts written off.
[3] Inventory items written off against the allowance.
[4] Deductions to the deferred tax assets valuation allowance relate to decreased deferred tax assets and the release of the valuation allowance.