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Employee Stock-Based Compensation Share-based Compensation Equity Granted (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Employee stock-based compensation $ 11,200 $ 9,900 $ 20,602 $ 16,392
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock units granted     183 195
Weighted-average grant-date fair value     $ 67.17 $ 31.23
2010 Equity Incentive Plan [Member] | Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period (in years)     4 years  
Performance based restricted stock units granted (1) 168 329 612 616
Weighted-average grant-date fair value $ 71.47 $ 36.35 $ 49.04 $ 36.01
2010 Equity Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance based restricted stock units granted (1) 120 94    
Weighted-average grant-date fair value $ 71.20 $ 35.60    
2010 Equity Incentive Plan- Executive Employees [Member] | Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Period for recognition (in years)     3 years  
Minimum [Member] | 2010 Equity Incentive Plan [Member] | Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Target share percentage for shares issued     0.00%  
Maximum [Member] | 2010 Equity Incentive Plan [Member] | Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Target share percentage for shares issued     150.00%