Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Equity (Stock-based Compensation Plans) (Narrative) (Details)

v3.10.0.1
Equity (Stock-based Compensation Plans) (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 03, 2018
Vesting period 4 years      
Weighted average remaining contractual life 6 years 3 months 19 days      
Total intrinsic value of options exercised $ 600 $ 7,200 $ 1,500  
Unvested number of shares 1,000,000      
Unrecognized compensation cost $ 10,200      
Weighted average period over which unrecognized compensation cost will be recognized 1 year 10 months 25 days      
Restricted Stock [Member]        
Value of equity classified RSUs vested $ 2,100      
Unrecognized compensation cost $ 22,700      
Weighted average period over which unrecognized compensation cost will be recognized 2 years 7 months 6 days      
Performance Stock Units (PSUs) [Member]        
Unrecognized compensation cost $ 22,700      
Weighted average period over which unrecognized compensation cost will be recognized 2 years 7 months 6 days      
Employee Stock Option [Member] | Minimum [Member]        
Expected option term 5 years 3 months 19 days 5 years 1 month 6 days 5 years 2 months 12 days  
Employee Stock Option [Member] | Maximum [Member]        
Expected option term 5 years 6 months 6 years 6 years  
2012 Plan [Member]        
Expected option term 10 years      
Equity Incentive Plan, shares authorized 1,700,000      
Increase of shares reserved       200,000
2012 Plan [Member] | Employee Stock Option [Member] | Minimum [Member]        
Vesting period 2 years      
2012 Plan [Member] | Employee Stock Option [Member] | Maximum [Member]        
Vesting period 4 years