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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, 2019
Mar. 31, 2018
Earnings Per Share Calculation [Line Items]    
Net Income, Including Portion Attributable to Noncontrolling Interest $ 17,723 $ 18,063
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]    
Net Income Available to Common Stockholders, Diluted $ 17,723 $ 18,473
Weighted Average Number of Shares Outstanding, Basic 27,498 28,124
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]    
Incremental Common Shares Attributable to Stock Options 244 466
Incremental Common Shares Attributable to Deferred Compensation 228 211
Diluted Weighted Average Number of Shares Outstanding, Adjusted for Assumed Conversions 27,970 30,544
Earnings Per Share, Basic $ 0.64 $ 0.64
Earnings Per Share, Diluted $ 0.63 $ 0.60
Anti-dilutive stock equivalent awards not included in the calculation of diluted loss per share 606 0
2018 Convertible Senior Notes [Member]    
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract]    
Interest on Convertible Debt, Net of Tax $ 0 $ 410
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]    
Incremental Common Shares Attributable to Conversion of Debt Securities 0 1,743