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Compensation Plans (Activity of Restricted Stock Units) (Details) - Restricted Stock Units (RSUs) [Member] - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Future Service Required [Member]      
Shares      
Balance, beginning of period (shares) 3,388 4,238 4,793
Grants (shares) 0 0 0
Distributions of underlying shares 0 0 0
Forfeited (shares) 0 (626) (135)
Fulfillment of service requirement (shares) (3,320) (224) (420)
Balance, end of period (shares) 68 3,388 4,238
Weighted- Average Grant Date Fair Value      
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 26.90 26.90
Fulfillment of service requirement (USD per share) 26.90 26.90 26.90
Balance, end of period (USD per share) $ 26.90 $ 26.90 $ 26.90
No Future Service Required [Member]      
Shares      
Balance, beginning of period 8,583 8,467 8,316
Grants (shares) 128 121 97
Distributions of underlying shares (1,683) (229) (366)
Forfeited (shares) 0 0 0
Fulfillment of service requirement (shares) (3,320) (224) (420)
Balance, end of period 10,348 8,583 8,467
Weighted- Average Grant Date Fair Value      
Balance, beginning of period (USD per share) $ 26.68 $ 26.79 $ 26.86
Grants (USD per share) 14.21 18.95 20.89
Distribution of underlying shares (USD per share) 26.59 22.34 26.85
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) $ 26.61 $ 26.68 $ 26.79
Senior Executive Compensation Plan [Member]      
Shares      
Balance, beginning of period (shares) 0    
Grants (shares) 3,434    
Forfeited (shares) 0    
Balance, end of period (shares) 3,434 0  
Weighted- Average Grant Date Fair Value      
Balance, beginning of period (USD per share) $ 0.00    
Grants (USD per share) 9.68    
Forfeited (USD per share) 0.00    
Balance, end of period (USD per share) $ 9.68 $ 0.00