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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, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares, beginning balance 131,770 145,901 145,901
Weighted average price, beginning balance $ 46.60 $ 46.59 $ 46.59
Number of shares, granted 0 0 0
Weighted average price, granted $ 0 $ 0 $ 0
Number of shares, exercised 0 (14,131) 0
Weighted average price, exercised $ 0.00 $ 46.50 $ 0
Number of shares, forfeited 0 0 0
Weighted average price, forfeited $ 0 $ 0 $ 0
Number of shares, ending balance 131,770 131,770 145,901
Weighted average price, ending balance $ 46.60 $ 46.60 $ 46.59