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Summary of Significant Accounting Policies - Share-Based Compensation (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 19, 2015
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 4 years      
Excess tax benefit for stock-based compensation   $ 7,227 $ 9,797 $ 0
Impact on adoption of ASU 2016-09     (454) [1] (1,453) [2]
Deferred tax effect   $ 8,445 695  
Accounting Standards Update 2016-09        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Deferred tax effect     1,453  
Additional Paid-in Capital        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Impact on adoption of ASU 2016-09 [2]       (5,999)
Additional Paid-in Capital | Accounting Standards Update 2016-09        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Impact on adoption of ASU 2016-09     5,999  
Retained Earnings        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Impact on adoption of ASU 2016-09     (454) [1] $ 4,546 [2]
Retained Earnings | Accounting Standards Update 2016-09        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Impact on adoption of ASU 2016-09     $ 4,546  
Revenue Based PRSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of target shares an employee can earn   200.00%    
Revenue Based PRSUs | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of target shares an employee can earn   200.00%    
Amendment And Restatement Of The 2006 Omnibus Award Plan (2015 Plan)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance based percentage   100.00%    
Amendment And Restatement Of The 2006 Omnibus Award Plan (2015 Plan) | Revenue Based PRSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance based percentage   50.00%    
Vesting period   3 years    
Amendment And Restatement Of The 2006 Omnibus Award Plan (2015 Plan) | Market Condition Based PRSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance based percentage   50.00%    
Vesting period   3 years    
Amendment And Restatement Of The 2006 Omnibus Award Plan (2015 Plan) | Market Condition Based PRSUs | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of target shares an employee can earn   200.00%    
[1] Refer to Note 2(d) to the consolidated financial statements for details.
[2] Refer to Note 2(p) to the consolidated financial statements for details.