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Stock-Based Compensation Stock-Based Compensation (Activity Pertaining to Stock Appreciation Rights) (Details) - Stock Appreciation Rights (SARs) - $ / shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares, beginning balance 91,255 131,770 131,770
Weighted average price, beginning balance $ 44.31 $ 46.60 $ 46.60
Number of shares, granted 0 0 0
Weighted average price, granted $ 0 $ 0 $ 0
Number of shares, exercised 0 0 0
Weighted average price, exercised $ 0.00 $ 0.00 $ 0.00
Number of shares, forfeited (91,255) (40,515) 0
Weighted average price, forfeited $ 44.31 $ 51.76 $ 0
Number of shares, ending balance 0 91,255 131,770
Weighted average price, ending balance $ 0.00 $ 44.31 $ 46.60