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

Equity (Summary of Stock Options Outstanding) (Details)

v3.7.0.1
Equity (Summary of Stock Options Outstanding) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Options Outstanding, Number Outstanding 2,615,461 2,449,742
Options Outstanding, Weighted-Average Remaining Contractual Life in Years 4 years 11 months 16 days  
Options Outstanding, Weighted-Average Exercise Price $ 37.21 $ 39.73
Options Exercisable, Number Exercisable 1,426,304  
Options Exercisable, Weighted-Average Exercise Price $ 38.63  
Options Outstanding, Aggregate intrinsic value $ 4,100  
Options Exercisable, Aggregate intrinsic value $ 4,082  
$2.21 - $22.16 [Member]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Range of Exercise Prices (Lower) $ 2.21  
Range of Exercise Prices (Upper) $ 22.16  
Options Outstanding, Number Outstanding 666,353  
Options Outstanding, Weighted-Average Remaining Contractual Life in Years 2 years 2 months 16 days  
Options Outstanding, Weighted-Average Exercise Price $ 11.03  
Options Exercisable, Number Exercisable 604,717  
Options Exercisable, Weighted-Average Exercise Price $ 10.04  
$23.41 - $25.50 [Member]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Range of Exercise Prices (Lower) 23.41  
Range of Exercise Prices (Upper) $ 25.50  
Options Outstanding, Number Outstanding 663,895  
Options Outstanding, Weighted-Average Remaining Contractual Life in Years 6 years 2 months 1 day  
Options Outstanding, Weighted-Average Exercise Price $ 23.93  
Options Exercisable, Number Exercisable 100,661  
Options Exercisable, Weighted-Average Exercise Price $ 25.10  
$29.37 - $45.00 [Member]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Range of Exercise Prices (Lower) 29.37  
Range of Exercise Prices (Upper) $ 45.00  
Options Outstanding, Number Outstanding 654,586  
Options Outstanding, Weighted-Average Remaining Contractual Life in Years 7 years 3 months 15 days  
Options Outstanding, Weighted-Average Exercise Price $ 34.99  
Options Exercisable, Number Exercisable 247,231  
Options Exercisable, Weighted-Average Exercise Price $ 35.14  
$46.87 - $120.51 [Member]    
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]    
Range of Exercise Prices (Lower) 46.87  
Range of Exercise Prices (Upper) $ 120.51  
Options Outstanding, Number Outstanding 630,627  
Options Outstanding, Weighted-Average Remaining Contractual Life in Years 4 years 2 months 9 days  
Options Outstanding, Weighted-Average Exercise Price $ 81.16  
Options Exercisable, Number Exercisable 473,695  
Options Exercisable, Weighted-Average Exercise Price $ 79.82