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Ownership, Description of Business, and Significant Accounting Policies (Details 1) (USD $)
In Thousands, except Per Share data, unless otherwise specified |
3 Months Ended | 12 Months Ended | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2012
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Sep. 30, 2012
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Jun. 30, 2012
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Mar. 31, 2012
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Dec. 31, 2011
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Sep. 30, 2011
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Jun. 30, 2011
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Mar. 31, 2011
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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| Components of basic and diluted earnings per share | |||||||||||
| Income from continuing operations | $ 20,167 | $ 21,308 | $ 18,988 | $ 18,108 | $ 17,235 | $ 15,310 | $ 14,766 | $ 13,282 | $ 78,571 | $ 60,593 | $ 47,394 |
| (Loss) income from discontinued operations, net of tax | (2,392) | (6,702) | (101) | 60 | 9 | 397 | (9,094) | 365 | 1,658 | ||
| Net income | $ 20,167 | $ 21,308 | $ 16,596 | $ 11,406 | $ 17,134 | $ 15,370 | $ 14,775 | $ 13,679 | $ 69,477 | $ 60,958 | $ 49,052 |
| Weighted average common shares outstanding - basic | 24,855 | 24,572 | 23,897 | ||||||||
| Dilutive effect of stock-based awards | 981 | 1,118 | 1,194 | ||||||||
| Weighted average common shares outstanding - diluted | 25,836 | 25,690 | 25,091 | ||||||||
| Basic earnings (loss) per share from: | |||||||||||
| Continuing operations | $ 0.82 | $ 0.85 | $ 0.76 | $ 0.73 | $ 0.70 | $ 0.62 | $ 0.60 | $ 0.55 | $ 3.16 | $ 2.47 | $ 1.98 |
| Discontinued operations | $ 0.00 | $ 0.00 | $ (0.09) | $ (0.27) | $ (0.01) | $ 0.00 | $ 0.00 | $ 0.01 | $ (0.36) | $ 0.01 | $ 0.07 |
| Net basic earnings per share | $ 2.80 | $ 2.48 | $ 2.05 | ||||||||
| Diluted earnings (loss) per share from: | |||||||||||
| Continuing operations | $ 0.79 | $ 0.82 | $ 0.74 | $ 0.70 | $ 0.67 | $ 0.60 | $ 0.58 | $ 0.52 | $ 3.04 | $ 2.36 | $ 1.89 |
| Discontinued operations | $ 0.00 | $ 0.00 | $ (0.10) | $ (0.26) | $ 0.00 | $ 0.00 | $ 0.00 | $ 0.02 | $ (0.35) | $ 0.01 | $ 0.06 |
| Net diluted earnings per share | $ 2.69 | $ 2.37 | $ 1.95 | ||||||||