Annual report pursuant to Section 13 and 15(d)

Nature Of Operations And Accounting Policies (Schedule Of Earnings Per Share) (Details)

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Nature Of Operations And Accounting Policies (Schedule Of Earnings Per Share) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                      
Net Income $ (1,917) $ 6,405 $ 14,553 $ 7,733 $ (4,686) $ 17,067 $ 45,126 $ 641 $ 26,774 $ 58,148 $ 61,643
Basic Weighted Average Common Shares Outstanding                      
Options and Restricted Stock                 0 0 0
Convertible Securities                 1,273 1,273 14,346
Net income, diluted                 $ 28,047 $ 59,421 $ 75,989
Weighted average number of shares outstanding, basic (in shares)                 18,949,981 18,080,778 17,368,081
Effect of Dilutive Securities:                      
Options and Restricted Stock (in shares)                 129,250 267,810 308,012
Convertible Securities (in shares)                 1,227,101 1,227,101 5,258,065
Weighted average number of shares outstanding, diluted (in shares)                 20,306,332 19,575,689 22,934,158
Basic earnings per common share (in dollars per share) $ (0.10) $ 0.33 $ 0.80 $ 0.42 $ (0.26) $ 0.94 $ 2.50 $ 0.04 $ 1.41 $ 3.22 $ 3.55
Diluted earnings per common share (in dollars per share) $ (0.10) $ 0.32 $ 0.76 $ 0.41 $ (0.26) $ 0.88 $ 2.14 $ 0.04 $ 1.38 $ 3.04 $ 3.31
3.0% Convertible Senior Notes                      
Effect of Dilutive Securities:                      
Debt instrument, stated percentage 3.00%               3.00%    
3.25% Convertible Senior Notes                      
Effect of Dilutive Securities:                      
Debt instrument, stated percentage 3.25%               3.25%    
Stock Compensation Plan                      
Effect of Dilutive Securities:                      
Antidilutive securities excluded from computation of earnings per share (in shares)                 827,222 333,510 1,924,217
Convertible Debt Securities | 3.0% Convertible Senior Notes                      
Effect of Dilutive Securities:                      
Antidilutive securities excluded from computation of earnings per share (in shares)                 928,464 1,946,917  
Convertible Debt Securities | 3.25% Convertible Senior Notes                      
Effect of Dilutive Securities:                      
Antidilutive securities excluded from computation of earnings per share (in shares)                 1,553,780 983,351