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Compensation Plans - Schedule of Activity in RSUs (Details) - Restricted Stock Units (RSUs) - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Future Service Required      
Shares      
Nonvested balance, beginning of period (shares) 68 3,388 4,238
Grants (shares) 0 0 0
Distributions of underlying shares 0 0 0
Forfeited (shares) 0 0 (626)
Fulfillment of service requirement (shares) (36) (3,320) (224)
Nonvested balance, end of period (shares) 32 68 3,388
Weighted- Average Grant Date Fair Value      
Nonvested balance, beginning of period (USD per share) $ 26.90 $ 26.90 $ 26.90
Grants (USD per share) 0.00 0.00 0.00
Distribution of underlying shares (USD per share) 0.00 0.00 0.00
Forfeited (USD per share) 0.00 0.00 26.90
Fulfillment of service requirement (USD per share) 26.90 26.90 26.90
Nonvested balance, end of period (USD per share) $ 26.90 $ 26.90 $ 26.90
No Future Service Required      
Shares      
Vested balance, beginning of period (shares) 10,348 8,583 8,467
Grants (shares) 104 128 121
Distributions of underlying shares (175) (1,683) (229)
Forfeited (shares) 0 0 0
Fulfillment of service requirement (shares) (36) (3,320) (224)
Vested balance, end of period (shares) 10,313 10,348 8,583
Weighted- Average Grant Date Fair Value      
Balance, beginning of period (USD per share) $ 26.61 $ 26.68 $ 26.79
Grants (USD per share) 21.55 14.21 18.95
Distribution of underlying shares (USD per share) 26.46 26.59 22.34
Forfeited (USD per share) 0.00 0.00 0.00
Fulfillment of service requirement (USD per share) 26.90 26.90 26.90
Balance, end of period, weighted average grant date fair value (USD per share) $ 26.57 $ 26.61 $ 26.68
Senior Executive Compensation Plan      
Shares      
Nonvested balance, beginning of period (shares) 3,434 0  
Grants (shares) 2,221 3,434  
Forfeited (shares) 0 0  
Nonvested balance, end of period (shares) 5,655 3,434 0
Weighted- Average Grant Date Fair Value      
Nonvested balance, beginning of period (USD per share) $ 9.68 $ 0.00  
Grants (USD per share) 19.06 9.68  
Forfeited (USD per share) 0.00 0.00  
Nonvested balance, end of period (USD per share) $ 13.37 $ 9.68 $ 0.00