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Stock-Based Compensation (Stock Appreciation Rights) (Details) - SARs - USD ($)
9 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares outstanding (in shares) 314 2,338
Shares exercisable (in shares) 314  
Shares outstanding, weighted-average exercise price (in dollars per share) $ 23.77 $ 27.37
Shares exercisable, weighted-average exercise price (in dollars per share) $ 23.77  
Shares outstanding, weighted-average remaining contractual life 5 months  
Shares exercisable, weighted-average remaining contractual life 5 months  
Shares outstanding, aggregate intrinsic value $ 3,083  
Shares exercisable, aggregate intrinsic value $ 3,083  
Forfeited 2,024  
Forfeited $ 27.93