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Stock-Based Compensation (Stock Appreciation Rights) (Details) - SARs - $ / shares
6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares outstanding (in shares) 0 314
Shares exercisable (in shares) 0  
Shares outstanding, weighted-average exercise price (in dollars per share) $ 0.00 $ 23.77
Shares exercisable, weighted-average exercise price (in dollars per share) $ 0.00  
Forfeited 314  
Forfeited $ 23.77