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Share-Based Compensation - Employee Share Option Exchange Program (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Sep. 25, 2015
USD ($)
$ / shares
shares
Aug. 28, 2015
Mar. 31, 2016
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
shares
Share-Based Compensation            
Vesting period 3 years          
Total incremental stock-based compensation expense recognized $ 1,400          
Share-based compensation expense       $ 51,313 $ 49,145 $ 41,169
Options            
Share-Based Compensation            
Options exchanged (in shares) | shares 1,975,009          
Share-based compensation expense       $ 8,441 $ 7,969 $ 7,591
RSUs            
Share-Based Compensation            
Exchange ratio   2        
Vesting period     5 years      
RSUs issued (in shares) | shares 987,496     1,772,263 1,165,578 2,344,034
Fair value (USD per share) | $ / shares $ 12.43          
Share-based compensation expense       $ 34,077 $ 25,959 $ 20,946
Minimum | RSUs            
Share-Based Compensation            
Vesting period   3 years        
Maximum | RSUs            
Share-Based Compensation            
Vesting period   4 years        
Employer Share Option Exchange Program            
Share-Based Compensation            
Share-based compensation expense       $ 300 $ 500 $ 500