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

Equity (Summary of Stock Options Outstanding) (Details)

v3.10.0.1
Equity (Summary of Stock Options Outstanding) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Options Outstanding, Number Outstanding 2,551,743 3,330,953
Options Outstanding, Weighted-Average Remaining Contractual Life in Years 6 years 11 months 1 day  
Options Outstanding, Weighted-Average Exercise Price $ 30.82 $ 31.53
Options Exercisable, Number Exercisable 1,556,519  
Options Exercisable, Weighted-Average Exercise Price $ 36.96  
Options Outstanding, Aggregate intrinsic value $ 53  
Options Exercisable, Aggregate intrinsic value $ 53  
$2.74 - $19.59 [Member]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Range of Exercise Prices (Lower) $ 2.74  
Range of Exercise Prices (Upper) $ 19.59  
Options Outstanding, Number Outstanding 34,810  
Options Outstanding, Weighted-Average Remaining Contractual Life in Years 8 years 11 months 4 days  
Options Outstanding, Weighted-Average Exercise Price $ 17.86  
Options Exercisable, Number Exercisable 22,309  
Options Exercisable, Weighted-Average Exercise Price $ 16.89  
$19.66 - $19.66 [Member]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Range of Exercise Prices (Lower) 19.66  
Range of Exercise Prices (Upper) $ 19.66  
Options Outstanding, Number Outstanding 1,056,722  
Options Outstanding, Weighted-Average Remaining Contractual Life in Years 8 years 18 days  
Options Outstanding, Weighted-Average Exercise Price $ 19.66  
Options Exercisable, Number Exercisable 452,620  
Options Exercisable, Weighted-Average Exercise Price $ 19.66  
$19.96 - $23.41 [Member]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Range of Exercise Prices (Lower) 19.96  
Range of Exercise Prices (Upper) $ 23.41  
Options Outstanding, Number Outstanding 705,283  
Options Outstanding, Weighted-Average Remaining Contractual Life in Years 7 years 18 days  
Options Outstanding, Weighted-Average Exercise Price $ 21.91  
Options Exercisable, Number Exercisable 394,269  
Options Exercisable, Weighted-Average Exercise Price $ 21.99  
$24.66 - $120.51 [Member]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Range of Exercise Prices (Lower) 24.66  
Range of Exercise Prices (Upper) $ 120.51  
Options Outstanding, Number Outstanding 754,928  
Options Outstanding, Weighted-Average Remaining Contractual Life in Years 5 years 1 month 16 days  
Options Outstanding, Weighted-Average Exercise Price $ 55.36  
Options Exercisable, Number Exercisable 687,321  
Options Exercisable, Weighted-Average Exercise Price $ 57.60