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Earnings per Share Earnings per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Earnings Per Share Calculation [Line Items]    
Net Income, Including Portion Attributable to Noncontrolling Interest $ 16,883 $ 9,189
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]    
Preferred Dividends (1,219) (1,219)
Net income to common shareholders 15,664 7,970
Net Income Available to Common Stockholders, Diluted $ 16,584 $ 8,875
Weighted Average Number of Shares Outstanding, Basic 24,738 24,657
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]    
Incremental Common Shares Attributable to Stock Options 332 168
Incremental Common Shares Attributable to Deferred Compensation 174 122
Weighted Average Number of Shares Outstanding, Diluted 30,329 30,032
Earnings Per Share, Basic $ 0.63 $ 0.32
Earnings Per Share, Diluted $ 0.55 $ 0.30
Anti-dilutive stock equivalent awards not included in the calculation of diluted loss per share 95 1,539
2017 Convertible Senior Notes [Member]    
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]    
Interest on Convertible Debt, Net of Tax $ 392 $ 385
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]    
Incremental Common Shares Attributable to Conversion of Debt Securities 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 $ 528 $ 520
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]    
Incremental Common Shares Attributable to Conversion of Debt Securities 2,669 2,669