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Shareholders' Equity (Share-Based Compensation Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Feb. 28, 2017
Jun. 30, 2017
Jun. 30, 2017
Jun. 30, 2016
Equity [Abstract]        
Unrecognized compensation cost   $ 66,600 $ 66,600  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation     $ 27,005 $ 29,585
Performance Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of award at grant under free cash flow performance metric 50.00%      
Performance cycle 3 years      
Percentage of award at grant tied to TSR performance 50.00%      
Nonvested Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average remaining requisite service period, non-vested restricted stock units     2 years 10 months 10 days  
Nonvested Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average remaining requisite service period, non-vested restricted stock units     2 years 3 months 29 days  
The Plan | Stock Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Additional ordinary shares authorized for issuance   10,000,000    
Issuance of ordinary shares related to the employee stock purchase plan (in shares)       0