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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, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Earnings Per Share Calculation [Line Items] |  |  |  |  |  |
Net Income, Including Portion Attributable to Noncontrolling Interest | $ 30,246 | $ 17,723 | $ 27,911 | $ 18,063 | $ 47,969 | $ 45,974
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract] |  |  |  |  |  |
Net Income Available to Common Stockholders, Diluted | $ 30,246 |  | $ 27,911 |  | $ 47,969 | $ 46,383
Weighted Average Number of Shares Outstanding, Basic | 27,599 |  | 28,571 |  | 27,549 | 28,349
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract] |  |  |  |  |  |
Incremental Common Shares Attributable to Stock Options | 308 |  | 353 |  | 276 | 409
Incremental Common Shares Attributable to Deferred Compensation | 183 |  | 177 |  | 202 | 194
Diluted Weighted Average Number of Shares Outstanding, Adjusted for Assumed Conversions | 28,090 |  | 29,101 |  | 28,027 | 29,818
Earnings Per Share, Basic | $ 1.10 |  | $ 0.98 |  | $ 1.74 | $ 1.62
Earnings Per Share, Diluted | $ 1.08 |  | $ 0.96 |  | $ 1.71 | $ 1.56
Anti-dilutive stock equivalent awards not included in the calculation of diluted loss per share | 412 |  | 434 |  | 714 | 326
2018 Convertible Senior Notes [Member] |  |  |  |  |  |
Dilutive Securities, Effect on Basic Earnings Per Share [Abstract] |  |  |  |  |  |
Interest on Convertible Debt, Net of Tax | $ 0 |  | $ 0 |  | $ 0 | $ 409
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract] |  |  |  |  |  |
Incremental Common Shares Attributable to Conversion of Debt Securities | 0 |  | 0 |  | 0 | 866

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