XML 98 R83.htm IDEA: XBRL DOCUMENT v3.10.0.1
Stock-Based Compensation - Narrative (Details)
1 Months Ended 12 Months Ended
Feb. 22, 2016
USD ($)
shares
Feb. 19, 2016
performance_criteria
Jan. 05, 2016
USD ($)
shares
Jan. 31, 2018
USD ($)
Feb. 28, 2015
Dec. 31, 2018
USD ($)
Award_Type
shares
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based compensation expense           $ 33,100,000 $ 34,000,000 $ 26,000,000
Excess tax expense for stock-based compensation           300,000 3,000,000  
Stock-based compensation tax benefit               2,100,000
Defined contribution cost recognized           $ 3,100,000    
Deferred Compensation, Share-based Payments                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Common shares held in employee trust earned but not distributed (in shares) | shares           495,774    
Restricted Stock Awards                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based compensation expense           $ 2,800,000 500,000 400,000
Award vesting period           3 years    
Compensation cost not yet recognized           $ 1,100,000    
Fair value of award           $ 200,000 900,000 200,000
Period of recognition for unrecognized compensation costs           6 months    
Aggregate intrinsic value           $ 3,400,000    
Weighted-average remaining contractual term of non-vested shares           5 months 1 day    
Restricted Stock Awards | Minimum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Expected forfeiture rate           5.00%    
Restricted Stock Awards | Maximum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Expected forfeiture rate           6.00%    
Restricted Stock Awards | Graduated or graded vesting | Minimum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting period           3 years    
Restricted Stock Awards | Graduated or graded vesting | Maximum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting period           4 years    
Restricted Stock Units                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based compensation expense           $ 0 1,400,000 1,400,000
Aggregate intrinsic value           $ 11,000,000    
Stock Appreciation Rights                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Term of award           7 years    
Stock Appreciation Rights | Graduated or graded vesting                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting period           3 years    
Performance Shares                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based compensation expense           $ 30,600,000 29,100,000 21,300,000
Award vesting period           3 years    
Compensation cost not yet recognized           $ 24,700,000    
Number of performance award types | Award_Type           3    
Period of recognition for unrecognized compensation costs           11 months 4 days    
Aggregate intrinsic value           $ 72,500,000    
Weighted-average remaining contractual term of non-vested shares           1 year 1 month 25 days    
Number of performance awards where the performance period has ended | Award_Type           2    
Performance Shares | Minimum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Expected forfeiture rate           0.00%    
Performance Shares | Maximum                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Expected forfeiture rate           6.00%    
Internal Metrics Performance Share Awards                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of performance award types | Award_Type           2    
Rights to share portion of award, maximum percent           100.00%    
Market Based Performance Share Awards                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of performance award types | Award_Type           1    
Rights to share portion of award, maximum percent           100.00%    
Rights to cash portion of award, maximum percent           100.00%    
Employee Performance Share Awards                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting period         3 years 3 years    
Number of performance criteria | performance_criteria   3            
Number of performance awards issued and certified (in shares) | shares 389,920              
Grant date fair value of performance shares issued and certified $ 7,900,000              
Hybrid Performance Shares                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Minimum operating cash flow for performance based award           $ 100,000,000    
Hybrid Performance Shares | Graduated or graded vesting                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting period           3 years    
Hybrid Performance Shares | 25% vesting on first and second anniversary                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting percentage           25.00%    
Hybrid Performance Shares | 50% vesting on third anniversary                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Award vesting percentage           50.00%    
TSR Performance Share Awards                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Performance period of peer group           3 years    
Cash payments for share-based compensation           $ 3,300,000 0 $ 1,800,000
Number of performance awards issued and certified (in shares) | shares     407,907          
Grant date fair value of performance shares issued and certified     $ 7,600,000          
Payments for stock-based compensation       $ 5,000,000        
TSR Performance Share Awards | Liability                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Current portion of share-based liability           5,000,000 3,300,000  
Noncurrent portion of share-based liability           $ 7,900,000 $ 6,600,000