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Earnings per Share Earnings per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Earnings Per Share Calculation [Line Items]        
Net Income, Including Portion Attributable to Noncontrolling Interest $ 16,989 $ 15,916 $ 33,872 $ 25,105
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]        
Preferred Dividends (1,219) (1,219) (2,438) (2,438)
Net income to common shareholders 15,770 14,697 31,434 22,667
Net Income Available to Common Stockholders, Diluted $ 16,688 $ 15,613 $ 33,271 $ 24,484
Weighted Average Number of Shares Outstanding, Basic 24,990 24,669 24,864 24,663
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]        
Incremental Common Shares Attributable to Stock Options 335 185 330 177
Incremental Common Shares Attributable to Deferred Compensation 209 138 192 130
Weighted Average Number of Shares Outstanding, Diluted 30,619 30,077 30,471 30,055
Earnings Per Share, Basic $ 0.63 $ 0.60 $ 1.26 $ 0.92
Earnings Per Share, Diluted $ 0.55 $ 0.52 $ 1.09 $ 0.81
Anti-dilutive stock equivalent awards not included in the calculation of diluted loss per share 0 1,261 47 1,301
2017 Convertible Senior Notes [Member]        
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]        
Interest on Convertible Debt, Net of Tax $ 391 $ 390 $ 782 $ 774
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]        
Incremental Common Shares Attributable to Conversion of Debt Securities 2,416 2,416 2,416 2,416
2018 Convertible Senior Notes [Member]        
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]        
Interest on Convertible Debt, Net of Tax $ 527 $ 526 $ 1,055 $ 1,043
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]        
Incremental Common Shares Attributable to Conversion of Debt Securities 2,669 2,669 2,669 2,669