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Earnings Per Share (Reconciliation of EPS) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Basic EPS: [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income from continuing operations | $ 25,335 | $ 32,653 | $ 27,122 | $ 22,305 | $ 1,308 | $ 18,274 | $ 288 | $ 18,093 | $ 107,415 | $ 37,963 | $ 22,683
Loss on disposal of discontinued operations |  |  |  |  |  |  |  |  | (997) | 0 | (650)
Net income | 25,335 | 32,653 | 27,122 | 21,308 | 1,308 | 18,274 | 288 | 18,093 | 106,418 | 37,963 | 22,033
Net income, basic shares |  |  |  |  |  |  |  |  | 55,638 | 54,880 | 54,095
Basic net income from continuing operations |  |  |  |  |  |  |  |  | $ 1.93 | $ 0.69 | $ 0.42
Basic net loss from discontinued operations |  |  |  |  |  |  |  |  | $ (0.02) | $ 0.00 | $ (0.01)
Basic net income | $ 0.45 | $ 0.59 | $ 0.49 | $ 0.38 | $ 0.02 | $ 0.33 | $ 0.01 | $ 0.33 | $ 1.91 | $ 0.69 | $ 0.41
Effect of dilutive securities: [Abstract] |  |  |  |  |  |  |  |  |  |  |
Stock compensation plans, shares |  |  |  |  |  |  |  |  | 1,172 | 1,053 | 1,126
Earnings Per Share, Diluted [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net income from continuing operations | 25,335 | 32,653 | 27,122 | 22,305 | 1,308 | 18,274 | 288 | 18,093 | 107,415 | 37,963 | 22,683
Loss on disposal of discontinued operations |  |  |  |  |  |  |  |  | (997) | 0 | (650)
Net income | $ 25,335 | $ 32,653 | $ 27,122 | $ 21,308 | $ 1,308 | $ 18,274 | $ 288 | $ 18,093 | $ 106,418 | $ 37,963 | $ 22,033
Shares net income, Diluted |  |  |  |  |  |  |  |  | 56,810 | 55,933 | 55,221
Diluted net income from continuing operations |  |  |  |  |  |  |  |  | $ 1.89 | $ 0.68 | $ 0.41
Diluted net loss from discontinued operations |  |  |  |  |  |  |  |  | $ (0.02) | $ 0.00 | $ (0.01)
Diluted net income | $ 0.44 | $ 0.57 | $ 0.48 | $ 0.38 | $ 0.02 | $ 0.33 | $ 0.01 | $ 0.33 | $ 1.87 | $ 0.68 | $ 0.40

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