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

Equity (Summary of Stock Options Outstanding) (Details)

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Equity (Summary of Stock Options Outstanding) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Options Outstanding, Number Outstanding 1,961,532 2,551,743
Options Outstanding, Weighted-Average Remaining Contractual Life in Years 6 years 3 months 21 days  
Options Outstanding, Weighted-Average Exercise Price $ 31.16 $ 30.82
Options Exercisable, Number Exercisable 1,585,035  
Options Exercisable, Weighted-Average Exercise Price $ 33.73  
Options Outstanding, Aggregate intrinsic value $ 563  
Options Exercisable, Aggregate intrinsic value $ 405  
$2.74 - $19.59 [Member]    
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Range of Exercise Prices (Lower) $ 2.74  
Range of Exercise Prices (Upper) $ 19.59  
Options Outstanding, Number Outstanding 33,828  
Options Outstanding, Weighted-Average Remaining Contractual Life in Years 8 years 1 month 13 days  
Options Outstanding, Weighted-Average Exercise Price $ 18.20  
Options Exercisable, Number Exercisable 33,828  
Options Exercisable, Weighted-Average Exercise Price $ 18.20  
$19.66 - $19.66 [Member]    
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Range of Exercise Prices (Lower) 19.66  
Range of Exercise Prices (Upper) $ 19.66  
Options Outstanding, Number Outstanding 828,891  
Options Outstanding, Weighted-Average Remaining Contractual Life in Years 6 years 11 months 23 days  
Options Outstanding, Weighted-Average Exercise Price $ 19.66  
Options Exercisable, Number Exercisable 566,036  
Options Exercisable, Weighted-Average Exercise Price $ 19.66  
$19.96 - $23.41 [Member]    
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Range of Exercise Prices (Lower) 19.96  
Range of Exercise Prices (Upper) $ 23.41  
Options Outstanding, Number Outstanding 523,812  
Options Outstanding, Weighted-Average Remaining Contractual Life in Years 7 years 2 months 23 days  
Options Outstanding, Weighted-Average Exercise Price $ 22.05  
Options Exercisable, Number Exercisable 415,233  
Options Exercisable, Weighted-Average Exercise Price $ 22.25  
$24.66 - $120.51 [Member]    
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]    
Range of Exercise Prices (Lower) 24.66  
Range of Exercise Prices (Upper) $ 120.51  
Options Outstanding, Number Outstanding 575,001  
Options Outstanding, Weighted-Average Remaining Contractual Life in Years 4 years 4 months 20 days  
Options Outstanding, Weighted-Average Exercise Price $ 56.75  
Options Exercisable, Number Exercisable 569,938  
Options Exercisable, Weighted-Average Exercise Price $ 57.00