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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2018
Restricted Stock Units (RSUs)  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule Of Transactions Of Share Based Compensation Other Than Stock Options
(shares)
Restricted Stock
Units
 
Weighted Average
Award Date Fair 
Value Per Unit ($)
Non-vested at December 31, 2017
698,126

 
15.09

Granted
158,689

 
21.94

Forfeited
(6,890
)
 
21.42

Vested
(671,247
)
 
14.91

Non-vested at December 31, 2018
178,678

 
21.82
Performance Shares  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Schedule Of Transactions Of Share Based Compensation Other Than Stock Options
(shares)
Performance
Awards
 
Weighted Average
Grant Date Fair 
Value Per Unit ($)(1)
Non-vested at December 31, 2017
1,184,773

 
19.52

Granted
514,338

 
22.51

Forfeited
(64,393
)
 
26.79

Vested
—

 
—

Non-vested at December 31, 2018
1,634,718

 
20.45