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Share-Based Compensation (PSU Activity) (Details) - $ / shares
shares in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
PSUs      
PSUs (Number of Shares):      
Nonvested at beginning of period 1,551    
Vested (231) (161) (85)
Forfeited and expired (308)    
Granted 697    
Nonvested at end of period 1,709 1,551  
Vested and expected to vest at end of period 1,449    
Weighted Average Grant Date Fair Value (in dollars per share):      
Nonvested at beginning of period $ 12.16    
Vested 12.23    
Forfeited and expired 12.28    
Granted 9.41    
Nonvested at end of period 11.01 $ 12.16  
Vested and expected to vest at end of period $ 10.39    
Nonvested at end of period, weighted average remaining vesting term 1 year 3 months 18 days    
Performance Stock Units With Market Conditions [Member]      
Weighted Average Grant Date Fair Value (in dollars per share):      
Granted $ 9.41 $ 8.22 $ 15.19
Maximum [Member] | PSUs      
Weighted Average Grant Date Fair Value (in dollars per share):      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Award Payout Range 100.00% 200.00% 200.00%