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Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Numerator: |  |
Income from continuing operations after income tax expense | $ 18,283 | $ 18,767
Basic |  |
Weighted average common shares outstanding | 49,417 | 49,103
Diluted |  |
Stock options (1) | 25 |
Restricted stock awards (1) | 342 | 310
Contingent shares (2) | 52 | 118
Diluted weighted average common shares outstanding | 49,836 | 49,531
Basic earnings per share from continuing operations | $ 0.37 | $ 0.38
Diluted earnings per share from continuing operations | $ 0.37 | $ 0.38

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