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Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Current assets:                    
Cash and cash equivalents $ 28,924us-gaap_CashAndCashEquivalentsAtCarryingValue       $ 30,767us-gaap_CashAndCashEquivalentsAtCarryingValue       $ 32,743us-gaap_CashAndCashEquivalentsAtCarryingValue $ 13,561us-gaap_CashAndCashEquivalentsAtCarryingValue
Restricted cash 23,761us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue       21,314us-gaap_RestrictedCashAndCashEquivalentsAtCarryingValue          
Trade accounts receivable, less allowances of $9,111 and $6,673 at December 31, 2013 and 2012, respectively 70,811us-gaap_AccountsReceivableNetCurrent       103,802us-gaap_AccountsReceivableNetCurrent          
Inventories 72,678us-gaap_InventoryNet       69,813us-gaap_InventoryNet          
Deferred income taxes 39,999us-gaap_DeferredTaxAssetsNetCurrent       38,487us-gaap_DeferredTaxAssetsNetCurrent          
Prepaid expenses and other current assets 28,933us-gaap_PrepaidExpenseAndOtherAssetsCurrent       36,449us-gaap_PrepaidExpenseAndOtherAssetsCurrent          
Total current assets 265,106us-gaap_AssetsCurrent       300,632us-gaap_AssetsCurrent          
Property, plant and equipment, net 54,372us-gaap_PropertyPlantAndEquipmentNet       52,793us-gaap_PropertyPlantAndEquipmentNet          
Patents and other intangible assets, net 9,046us-gaap_IntangibleAssetsNetExcludingGoodwill       7,290us-gaap_IntangibleAssetsNetExcludingGoodwill          
Goodwill 53,565us-gaap_Goodwill   72,758us-gaap_Goodwill   74,388us-gaap_Goodwill       73,094us-gaap_Goodwill  
Deferred income taxes 22,394us-gaap_DeferredTaxAssetsNetNoncurrent       21,523us-gaap_DeferredTaxAssetsNetNoncurrent          
Other long-term assets 7,492us-gaap_OtherAssetsNoncurrent       7,920us-gaap_OtherAssetsNoncurrent          
Total assets 411,975us-gaap_Assets 415,524us-gaap_Assets 446,321us-gaap_Assets 464,153us-gaap_Assets 464,546us-gaap_Assets 528,174us-gaap_Assets 520,848us-gaap_Assets 680,596us-gaap_Assets    
Current liabilities:                    
Bank borrowings         16us-gaap_ShortTermBankLoansAndNotesPayable          
Trade accounts payable 20,674us-gaap_AccountsPayableTradeCurrent       22,575us-gaap_AccountsPayableTradeCurrent          
Other current liabilities 49,676us-gaap_OtherLiabilitiesCurrent       42,742us-gaap_OtherLiabilitiesCurrent          
Total current liabilities 70,350us-gaap_LiabilitiesCurrent       65,333us-gaap_LiabilitiesCurrent          
Long-term debt 20,000us-gaap_SecuredLongTermDebt       20,000us-gaap_SecuredLongTermDebt          
Deferred income taxes 13,026us-gaap_DeferredTaxLiabilitiesNoncurrent       11,350us-gaap_DeferredTaxLiabilitiesNoncurrent          
Other long-term liabilities 12,736us-gaap_OtherLiabilitiesNoncurrent       11,424us-gaap_OtherLiabilitiesNoncurrent          
Total liabilities 116,112us-gaap_Liabilities 108,531us-gaap_Liabilities 114,175us-gaap_Liabilities 103,178us-gaap_Liabilities 108,107us-gaap_Liabilities 195,755us-gaap_Liabilities 207,927us-gaap_Liabilities 382,051us-gaap_Liabilities    
Contingencies (Note 17)                      
Shareholders' equity:                    
Common shares $0.10 par value; 50,000,000 shares authorized; 18,102,335 and 19,339,329 issued and outstanding as of December 31, 2013 and 2012, respectively 1,810us-gaap_CommonStockValue       1,934us-gaap_CommonStockValue          
Additional paid-in capital 216,653us-gaap_AdditionalPaidInCapitalCommonStock       246,306us-gaap_AdditionalPaidInCapitalCommonStock          
Retained earnings 73,897us-gaap_RetainedEarningsAccumulatedDeficit       102,709us-gaap_RetainedEarningsAccumulatedDeficit          
Accumulated other comprehensive income 3,503us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax       5,490us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax          
Total shareholders' equity 295,863us-gaap_StockholdersEquity 306,993us-gaap_StockholdersEquity 332,146us-gaap_StockholdersEquity 360,975us-gaap_StockholdersEquity 356,439us-gaap_StockholdersEquity 332,419us-gaap_StockholdersEquity 312,921us-gaap_StockholdersEquity 298,545us-gaap_StockholdersEquity 280,304us-gaap_StockholdersEquity  
Total liabilities and shareholders' equity $ 411,975us-gaap_LiabilitiesAndStockholdersEquity $ 415,524us-gaap_LiabilitiesAndStockholdersEquity $ 446,321us-gaap_LiabilitiesAndStockholdersEquity $ 464,153us-gaap_LiabilitiesAndStockholdersEquity $ 464,546us-gaap_LiabilitiesAndStockholdersEquity $ 528,174us-gaap_LiabilitiesAndStockholdersEquity $ 520,848us-gaap_LiabilitiesAndStockholdersEquity $ 680,596us-gaap_LiabilitiesAndStockholdersEquity