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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, 2018
Mar. 31, 2017
Earnings Per Share Calculation [Line Items]    
Net Income, Including Portion Attributable to Noncontrolling Interest $ 18,063 $ 16,883
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]    
Preferred Dividends 0 (1,219)
Net income to common shareholders 18,063 15,664
Net Income Available to Common Stockholders, Diluted $ 18,473 $ 16,584
Weighted Average Number of Shares Outstanding, Basic 28,124 24,738
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]    
Incremental Common Shares Attributable to Stock Options 466 332
Incremental Common Shares Attributable to Deferred Compensation 211 174
Diluted Weighted Average Number of Shares Outstanding, Adjusted for Assumed Conversions 30,544 30,329
Earnings Per Share, Basic $ 0.64 $ 0.63
Earnings Per Share, Diluted $ 0.60 $ 0.55
Anti-dilutive stock equivalent awards not included in the calculation of diluted loss per share 0 95
2017 Convertible Senior Notes [Member]    
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]    
Interest on Convertible Debt, Net of Tax $ 0 $ 392
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]    
Incremental Common Shares Attributable to Conversion of Debt Securities 0 2,416
2018 Convertible Senior Notes [Member]    
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]    
Interest on Convertible Debt, Net of Tax $ 410 $ 528
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]    
Incremental Common Shares Attributable to Conversion of Debt Securities 1,743 2,669