v3.10.0.1
GENERAL (Schedule of Impact of Adoption of Financial Statements) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Statements of operations          
Revenues $ 227,118 $ 136,099 $ 436,989 $ 251,153  
Financial income (expenses), net (2,480) 3,595 (1,896) 5,005  
Net income 34,568 22,524 70,254 36,699  
Cash flows          
Net income 34,568 $ 22,524 70,254 36,699  
Changes in assets and liabilities:          
Deferred revenues 6,139   13,120 $ 6,935  
Balance Sheets          
Deferred Revenues - Current (3,407)   (3,407)   $ (2,559)
Deferred Revenues - Long term (47,595)   (47,595)   (31,453)
Retained earnings (132,554)   (132,554)   $ (66,172)
Balances without adoption of ASC 606 [Member]          
Statements of operations          
Revenues 227,067   436,938    
Financial income (expenses), net (1,913)   (817)    
Net income 35,084   71,282    
Cash flows          
Net income 35,084   71,282    
Changes in assets and liabilities:          
Deferred revenues 5,623   12,092    
Balance Sheets          
Deferred Revenues - Current (3,413)   (3,413)    
Deferred Revenues - Long term (42,689)   (42,689)    
Retained earnings (136,426)   (136,426)    
Effect of change [Member]          
Statements of operations          
Revenues 51   51    
Financial income (expenses), net (567)   (1,079)    
Net income (516)   (1,028)    
Cash flows          
Net income (516)   (1,028)    
Changes in assets and liabilities:          
Deferred revenues 516   1,028    
Balance Sheets          
Deferred Revenues - Current (6)   (6)    
Deferred Revenues - Long term (4,906)   (4,906)    
Retained earnings $ 3,872   $ 3,872