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Share-Based Compensation Share-Based Compensation (Summary of Quantitative Effects on Consolidated Financial Statements) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Income tax provision | $ 5,970 | $ 7,550 | $ 10,281 | $ 13,016
Net income | $ 13,794 | $ 14,725 | $ 24,011 | $ 26,276
Basic (usd per share) | $ 0.26 | $ 0.28 | $ 0.46 | $ 0.47
Diluted (usd per share) | $ 0.26 | $ 0.27 | $ 0.45 | $ 0.47
Diluted weighted average shares (in shares) | 53,151,134 | 53,574,702 | 53,176,425 | 53,563,676
Change in income taxes |  |  | $ 5,430 | $ 4,033
As Reported |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Income tax provision |  | 7,934 |  | 14,145
Net income |  | $ 14,341 |  | $ 25,147
Basic (usd per share) |  | $ 0.27 |  | $ 0.47
Diluted (usd per share) |  | $ 0.27 |  | $ 0.47
Diluted weighted average shares (in shares) |  | 53,401,238 |  | 53,395,361
Change in income taxes |  |  |  | $ 5,162

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