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Shareholders' Equity and Stock Incentive Plans (Summary of Performance Share Award Activity) (Details) - Performance Shares [Member] - $ / shares
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Performance Share Awards    
Unvested Shares/Units, Beginning of Period 182,209 144,955
Granted Shares/Units 130,302 93,771
Vested Shares/Units (31,244) (49,458)
Forfeited Shares/Units 0 0
Unearned Shares due to Market Condition (10,407) (7,059)
Unvested Shares/Units, End of Period 270,860 182,209
Weighted Average Grant Date Fair Value [Abstract]    
Grant Date Fair Value, Beginning of Period (USD per share) $ 27.01 $ 47.14
Granted, Grant Date Fair Value (USD per share) 14.20 19.09
Vested, Grant Date Fair Value (USD per share) 35.71 65.51
Forfeited, Grant Date Fair Value (USD per share) 0.00 0.00
Unearned Shares due to Market Condition, Weighted Average Grant Date Fair Value 35.71 65.51
Grant Date Fair Value, End of Period (USD per share) $ 19.51 $ 27.01