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Equity and Long-Term Incentive Plans (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation $ 53,545 $ 38,897 $ 31,020
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 94,500    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 2 years 6 months    
Excess Tax Benefit from Share-based Compensation, Operating Activities $ 2,200    
Excess tax benefits from share-based compensation arrangements 0 789 4,610
Other Labor-related Expenses 7,500 15,100 $ 30,500
Other Employee Related Liabilities $ 24,283 $ 44,837  
2016 Employee Stock Plan [Member] | Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 586,600    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years    
2016 Employee Stock Plan [Member] | Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 642,139    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years    
2016 Employee Stock Plan [Member] | Maximum [Member] | Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 200.00%    
2016 Employee Stock Plan [Member] | Minimum [Member] | Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 0.00%    
2011 Non-Employee Director Plan [Member] | Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 32,825 27,066  
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 100.00%    
Common Class A [Member] | 2016 Employee Stock Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 6,000,000    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 3,814,797    
Common Class A [Member] | 2016 Employee Stock Plan [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years    
Common Class A [Member] | 2011 Non-Employee Director Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 465,000    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 188,233    
Common Class A [Member] | 2011 Non-Employee Director Plan [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years