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Stock-Based Compensation (Activity Pertaining to Stock Appreciation Rights) (Details) - Stock Appreciation Rights (SARs) - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares, beginning balance 0 91,255 131,770
Weighted average price, beginning balance $ 0 $ 44.31 $ 46.60
Number of shares, granted 0 0 0
Weighted average price, granted   $ 0 $ 0
Number of shares, exercised   0 0
Weighted average price, exercised   $ 0 $ 0
Number of shares, forfeited   (91,255) (40,515)
Weighted average price, forfeited   $ 44.31 $ 51.76
Number of shares, ending balance 0 0 91,255
Weighted average price, ending balance   $ 0 $ 44.31