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Commitments and Contingencies (Details 2) - USD ($)
$ in Thousands
 12 Months Ended
Nov. 17, 2017
Aug. 16, 2013
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Contractual obligations          
Contractual Obligation, Due in Next Fiscal Year [1]     $ 21,558    
Contractual Obligation, Due in Second Year [1]     12,888    
Contractual Obligation, Due in Third Year [1]     9,062    
Contractual Obligation, Due in Fourth Year [1]     5,643    
Contractual Obligation, Due in Fifth Year [1]     174,660    
Contractual Obligation [1]     $ 223,811    
Terms of noncancellable license agreement, minimum (in years)     1 year    
Rent expense     $ 5,200 $ 4,400 $ 3,800
Property, Plant and Equipment Cost Capitalization Amount     40,320 40,320  
Imputed financing obligation          
Contractual obligations          
Contractual Obligation, Due in Next Fiscal Year [1],[2]     5,677    
Contractual Obligation, Due in Second Year [1],[2]     2,404    
Contractual Obligation, Due in Third Year [1],[2]     0    
Contractual Obligation, Due in Fourth Year [1],[2]     0    
Contractual Obligation, Due in Fifth Year [1],[2]     0    
Contractual Obligation [1],[2]     8,081    
Leases and other contractual obligations          
Contractual obligations          
Contractual Obligation, Due in Next Fiscal Year [1]     5,999    
Contractual Obligation, Due in Second Year [1]     5,117    
Contractual Obligation, Due in Third Year [1]     5,193    
Contractual Obligation, Due in Fourth Year [1]     3,271    
Contractual Obligation, Due in Fifth Year [1]     968    
Contractual Obligation [1]     20,548    
Software licenses          
Contractual obligations          
Contractual Obligation, Due in Next Fiscal Year [1],[3]     7,510    
Contractual Obligation, Due in Second Year [1],[3]     2,995    
Contractual Obligation, Due in Third Year [1],[3]     1,497    
Contractual Obligation, Due in Fourth Year [1],[3]     0    
Contractual Obligation, Due in Fifth Year [1],[3]     0    
Contractual Obligation [1],[3]     12,002    
Convertible notes          
Contractual obligations          
Contractual Obligation, Due in Next Fiscal Year [1]     0    
Contractual Obligation, Due in Second Year [1]     0    
Contractual Obligation, Due in Third Year [1]     0    
Contractual Obligation, Due in Fourth Year [1]     0    
Contractual Obligation, Due in Fifth Year [1]     172,500    
Contractual Obligation [1]     172,500    
Interest payments related to convertible notes          
Contractual obligations          
Contractual Obligation, Due in Next Fiscal Year [1]     2,372    
Contractual Obligation, Due in Second Year [1]     2,372    
Contractual Obligation, Due in Third Year [1]     2,372    
Contractual Obligation, Due in Fourth Year [1]     2,372    
Contractual Obligation, Due in Fifth Year [1]     1,192    
Contractual Obligation [1]     10,680    
Convertible notes | Senior, One Point One Two Five Percent Convertible Notes Due Two Thousand Eighteen [Member]          
Contractual obligations          
Face Value   $ 138,000 0 81,207  
Debt Instrument, Convertible, Remaining Discount Amortization Period   5 years      
Convertible notes | Senior, One Point Three Seven Five Percent Convertible Notes Due Two Thousand Twenty Three [Member] [Member]          
Contractual obligations          
Face Value $ 172,500   $ 172,500 $ 172,500  
Debt Instrument, Convertible, Remaining Discount Amortization Period 5 years   4 years 1 month 2 days    
[1] The above table does not reflect possible payments in connection with uncertain tax benefits of approximately $23.5 million including $21.4 million recorded as a reduction of long-term deferred tax assets and $2.1 million in long-term income taxes payable, as of December 31, 2018. As noted below in Note 16, “Income Taxes,” although it is possible that some of the unrecognized tax benefits could be settled within the next 12 months, the Company cannot reasonably estimate the outcome at this time.
[2] With respect to the imputed financing obligation, the main components of the difference between the amount reflected in the contractual obligations table and the amount reflected on the Consolidated Balance Sheets are the interest on the imputed financing obligation and the estimated common area expenses over the future periods. The amount includes the amended Ohio lease and the amended Sunnyvale lease.
[3] The Company has commitments with various software vendors for agreements generally having terms longer than one year.