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Stock-Based Compensation Plans (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended
Jan. 31, 2017
shares
Jun. 30, 2017
USD ($)
shares
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Installment
shares
Jun. 30, 2016
USD ($)
Dec. 30, 2016
$ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Shares reserved for stock options and warrants   331,312   331,312    
Share-based compensation | $   $ 10,400 $ 9,100 $ 20,375 $ 16,055  
Tax benefit for issuance of share-based awards | $   3,600 $ 3,300 7,300 $ 5,900  
Total unrecognized compensation cost related to nonvested share-based awards | $   $ 78,600   $ 78,600    
Employee service share-based compensation, unrecognized compensation costs on nonvested awards, weighted average period of recognition       2 years    
Potential maximum increase to common shares outstanding from restricted stock and other shares   16,766,000   16,766,000    
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   695,000   695,000    
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   5,659,000   5,659,000    
Future Service Required [Member] | Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Restricted shares, nonvested, number   1,304,000   1,304,000    
No Future Service Required [Member] | Restricted Stock Units [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Restricted shares, vested, number   10,412,000   10,412,000    
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%          
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   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%          
4% to 8% [Member] | Senior Executive Compensation Plan [Member] | Senior Executives [Member] | Restricted Stock Units [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of performance-based award eligible 1,075,268          
Greater than 8% [Member] | Senior Executive Compensation Plan [Member] | Senior Executives [Member] | Restricted Stock Units [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Additional incentive compensation, percentage 50.00%