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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 $ 30,486       $ 31,055       $ 33,207 $ 13,561
Restricted cash 23,761       21,314          
Trade accounts receivable, less allowances of $11,969 and $13,543 at December 31, 2013 and 2012, respectively 75,567       107,312          
Inventories 90,577       83,373          
Deferred income taxes 33,947       33,450          
Prepaid expenses and other current assets 25,906       34,079          
Total current assets 280,244       310,583          
Property, plant and equipment, net 54,606       53,835          
Patents and other intangible assets, net 9,046       7,290          
Goodwill 53,565   72,758   74,388       73,094  
Deferred income taxes 18,336       18,881          
Other long-term assets 7,385       7,920          
Total assets 423,182 430,058 459,450 475,758 472,897 539,566 530,395 694,106    
Current liabilities:                    
Bank borrowings         16          
Trade accounts payable 20,674       22,575          
Other current liabilities 46,146       39,594          
Total current liabilities 66,820       62,185          
Long-term debt 20,000       20,000          
Deferred income taxes 13,132       11,456          
Other long-term liabilities 12,736       11,424          
Total liabilities 112,688 111,001 114,223 102,366 105,065 193,599 205,196 381,734    
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 1,810       1,934          
Additional paid-in capital 216,653       246,306          
Retained earnings 89,332       114,847          
Accumulated other comprehensive income 2,699       4,745          
Total shareholders' equity 310,494 319,057 345,227 373,392 367,832 345,967 325,199 312,372 292,074  
Total liabilities and shareholder's equity $ 423,182 $ 430,058 $ 459,450 $ 475,758 $ 472,897 $ 539,566 $ 530,395 $ 694,106