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Stock-Based Compensation Plans (Narrative) (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended
Jan. 31, 2017
shares
Mar. 31, 2017
USD ($)
Installment
shares
Mar. 31, 2016
USD ($)
Dec. 30, 2016
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares reserved for stock options and warrants   341,462    
Share-based compensation | $   $ 9,983 $ 6,933  
Tax benefit for issuance of share-based awards | $   3,600 $ 2,500  
Total unrecognized compensation cost related to nonvested share-based awards | $   $ 89,800    
Employee service share-based compensation, unrecognized compensation costs on nonvested awards, weighted average period of recognition   2 years 1 month 6 days    
Potential maximum increase to common shares outstanding from restricted stock and other shares   16,719,000    
Sign-on and Retention Awards [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting period   4 years    
Amortization period   4 years    
Stock Appreciation Rights (SARs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock appreciation right granted (in shares)   0    
Other Shares Issuable [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Other shares issuable   689,000    
Director [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of annual installments | Installment   4    
Employees [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of annual installments | Installment   5    
Future Service Required [Member] | Restricted Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted shares, nonvested, number   5,666,000    
Future Service Required [Member] | Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted shares, nonvested, number   1,442,000    
No Future Service Required [Member] | Restricted Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted shares, vested, number   10,364,000    
Senior Executive Compensation Plan [Member] | Senior Executives [Member] | Restricted Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance measurement period 3 years      
Percentage of compensation beyond base salary will be performance-based 100.00%      
Employee service share-based compensation, holding period 3 years      
Stock price | $ / shares       $ 23.25
Performance measurement benchmark, percentage 8.00%      
Additional incentive compensation, percentage 50.00%      
Fixed stock option plan and senior executive warrant plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares available for grant   0    
Minimum [Member] | Senior Executive Compensation Plan [Member] | Senior Executives [Member] | Restricted Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance measurement benchmark, percentage 4.00%      
Number of performance-based award eligible 537,634      
Maximum [Member] | Senior Executive Compensation Plan [Member] | Senior Executives [Member] | Restricted Stock Units [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance measurement benchmark, percentage 12.00%      
Number of performance-based award eligible 1,075,268