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Consolidated Statements Of Equity - USD ($)
$ in Thousands
Total
TOTAL IPG PHOTONICS CORPORATION EQUITY
COMMON STOCK
TREASURY STOCK
ADDITIONAL PAID-IN CAPITAL
RETAINED EARNINGS
ACCUMULATED OTHER COMPREHENSIVE LOSS
NONCONTROLLING INTERESTS ("NCI")
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Effect of adopted accounting standards         $ 2,078 $ 2,145    
Balance, beginning of year (in shares) at Dec. 31, 2016     (53,251,805) (102,774)        
Balance, beginning of year at Dec. 31, 2016     $ 5 $ (8,946) 650,974 1,094,108 $ (178,583) $ 166
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Exercise of stock options and conversion of restricted stock units (in shares)     543,547          
Exercise of stock options and conversion of restricted stock units     $ 0          
Common stock issued under employee stock purchase plan (in shares)     19,882          
Common stock issued under employee stock purchase plan     $ 0   1,669      
Purchased common stock (in shares)     (215,860) (215,860)        
Purchased common stock     $ 0 $ (26,911)        
Stock-based compensation         16,989      
Common stock issued under employee stock option plan, net of shares withheld for employee taxes         21,627      
Net income attributable to IPG Photonics Corporation $ 294,658         294,658    
Translation adjustments 89,076           89,023 57
Unrealized loss on derivatives, net of tax (35)           (35)  
Unrealized loss on available-for-sale investments, net of tax 298           (240)  
Realized loss on available-for-sale investments, net of tax, reclassified to net income             538  
Noncontrolling interest of acquired company               (197)
Net income (loss) attributable to NCI (26)             (26)
Balance, end of period (in shares) at Sep. 30, 2017     (53,599,374) (318,634)        
Balance, end of period at Sep. 30, 2017 1,959,099 $ 1,959,099 $ 5 $ (35,857) 693,337 1,390,911 (89,297) 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Effect of adopted accounting standards         0 606 10  
Balance, beginning of year (in shares) at Dec. 31, 2017     (53,629,439) (378,269)        
Balance, beginning of year at Dec. 31, 2017 2,022,322   $ 5 $ (48,933) 704,727 1,443,867 (77,344) 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Exercise of stock options and conversion of restricted stock units (in shares)     342,673          
Exercise of stock options and conversion of restricted stock units     $ 0          
Common stock issued under employee stock purchase plan (in shares)     12,198          
Common stock issued under employee stock purchase plan     $ 0   2,288      
Purchased common stock (in shares)     (585,806) (585,806)        
Purchased common stock     $ 0 $ (111,926)        
Stock-based compensation         21,443      
Common stock issued under employee stock option plan, net of shares withheld for employee taxes         9,827      
Net income attributable to IPG Photonics Corporation 328,468         328,468    
Translation adjustments (67,072)           (67,072) (39)
Unrealized loss on derivatives, net of tax (3)           (3)  
Unrealized loss on available-for-sale investments, net of tax 0           0  
Realized loss on available-for-sale investments, net of tax, reclassified to net income             0  
Noncontrolling interest of acquired company               649
Net income (loss) attributable to NCI 235             235
Balance, end of period (in shares) at Sep. 30, 2018     (53,398,504) (964,075)        
Balance, end of period at Sep. 30, 2018 $ 2,206,808 $ 2,205,963 $ 5 $ (160,859) $ 738,285 $ 1,772,941 $ (144,409) $ 845