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Operations and Summary of Significant Accounting Policies - Shares and EPS (Details) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2015 $ / shares | Sep. 30, 2015 $ / shares | Jun. 30, 2015 $ / shares | Mar. 31, 2015 $ / shares | Dec. 31, 2014 $ / shares | Sep. 30, 2014 $ / shares | Jun. 30, 2014 $ / shares | Mar. 31, 2014 $ / shares | Dec. 31, 2015 USD ($) vote / shares series $ / shares shares | Dec. 31, 2014 USD ($) $ / shares shares | Dec. 31, 2013 USD ($) $ / shares shares | Dec. 31, 1999 rightpershare
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Document Fiscal Year Focus |  |  |  |  |  |  |  |  | 2015 |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Voting rights per common share | vote / shares |  |  |  |  |  |  |  |  | 1 |  |  |
Number of rights per common stock as a part of dividend distribution | rightpershare |  |  |  |  |  |  |  |  |  |  |  | 1
Percentage acquisition of common stock triggering exercise terms of rights, minimum |  |  |  |  |  |  |  |  | 15.00% |  |  |
Ownership interest held by any stockholder at date of rights distribution to which additional exercise terms for the Rights distributed apply (as a percent) |  |  |  |  |  |  |  |  | 25.00% |  |  |
Subsequent increase in ownership interest held by any stockholder after rights distribution to which additional exercise terms for the Rights distributed apply (as a percent) |  |  |  |  |  |  |  |  | 40.00% |  |  |
Redemption price per right (in cents per right) | $ / shares |  |  |  |  |  |  |  |  | $ 0.01 |  |  |
Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Number of series by which the Board may issue authorized and unissued preferred stock, minimum | series |  |  |  |  |  |  |  |  | 1 |  |  |
Reconciliation of basic earnings per share ("EPS") to diluted EPS |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ |  |  |  |  |  |  |  |  | $ 67,888 | $ 63,531 | $ 50,971 |
Basic weighted-average shares outstanding |  |  |  |  |  |  |  |  | 48,952 | 48,977 | 48,521 |
Dilutive effect of potential common stock equivalents - stock options (in shares) |  |  |  |  |  |  |  |  | 229 | 217 | 152 |
Diluted weighted-average shares outstanding |  |  |  |  |  |  |  |  | 49,181 | 49,194 | 48,673 |
Net earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic (in USD per share) | $ / shares | $ 0.30 | $ 0.44 | $ 0.44 | $ 0.20 | $ 0.21 | $ 0.42 | $ 0.42 | $ 0.25 | $ 1.39 | $ 1.30 | $ 1.05 |
Diluted (in USD per share) | $ / shares | $ 0.30 | $ 0.44 | $ 0.43 | $ 0.20 | $ 0.21 | $ 0.42 | $ 0.42 | $ 0.25 | $ 1.38 | $ 1.29 | $ 1.05 |
Potentially dilutive securities excluded from earnings per diluted share because their effect is anti-dilutive (in shares) |  |  |  |  |  |  |  |  | 0 | 0 | 0 |

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