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Equity - AOCI Rollforward (Details) - USD ($)
$ in Thousands, shares in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Changes in the balances of each component of AOCI        
Balance at the beginning of the period     $ 594,595  
Other comprehensive income (loss) $ 71 $ 852 35 $ 918
Balance at the end of the period 845,529   $ 845,529  
Ultratech        
Changes in the balances of each component of AOCI        
Issuance of shares for merger consideration (in shares)     7.2  
Accumulated Other Comprehensive Income        
Changes in the balances of each component of AOCI        
Balance at the beginning of the period     $ 1,777  
Other comprehensive income (loss)     35  
Balance at the end of the period 1,812   1,812  
Foreign Currency Translation        
Changes in the balances of each component of AOCI        
Balance at the beginning of the period     1,797  
Other comprehensive income (loss)     25  
Balance at the end of the period 1,822   1,822  
Unrealized Gains (Losses) on Available for Sale Securities        
Changes in the balances of each component of AOCI        
Balance at the beginning of the period     (20)  
Other comprehensive income (loss)     10  
Balance at the end of the period $ (10)   (10)  
Additional Paid-in Capital        
Changes in the balances of each component of AOCI        
Issuance of shares for merger consideration     228,800  
Convertible Senior Notes including deferred tax impact     47,500  
Convertible Senior Notes related to on-going share-based compensation activities     $ 11,400