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Earnings Per Common Share Computations (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Earnings Per Share [Abstract] |  |  |  |
Earnings from continuing operations | $ 57,333 | $ 50,309 | $ 56,633 | $ 51,398
Participating Securities, Distributed and Undistributed Earnings | (674) | (1,170) | (668) | (1,198)
Numerator for basic earnings from continuing operations per common share | 56,659 | 49,139 | 55,965 | 50,200
Net earnings and comprehensive income | 57,333 | 50,298 | 56,633 | 51,356
Net earnings allocated to participating securities | (674) | (1,170) | (668) | (1,198)
Numerator for basic net earnings per common share | 56,659 | 49,128 | 55,965 | 50,158
Income Loss From Continuing Operations, Diluted | 57,333 | 50,298 | 56,633 | 51,398
Net Income (Loss) Available to Common Stockholders, Diluted | $ 57,333 | $ 50,298 | $ 56,633 | $ 51,356
Earnings Per Share, Basic and Diluted [Abstract] |  |  |  |
Basic (in shares) | 17,531 | 17,268 | 17,475 | 17,239
Plus dilutive effect of stock options (in shares) | 140 | 242 | 200 | 232
Plus dilutive effect of participating securities (in shares) | 209 | 411 | 209 | 411
Diluted (in shares) | 17,880 | 17,921 | 17,884 | 17,882
Net earnings (in dollars per share), Basic | $ 3.23 | $ 2.85 | $ 3.20 | $ 2.91
Net earnings (in dollars per share), Diluted | $ 3.21 | $ 2.81 | $ 3.17 | $ 2.87

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- Definition The total amount of dividends declared in the period for each class of stock and the contractual amount of dividends (or interest on participating income bonds) that must be paid for the period (for example, unpaid cumulative dividends). Dividends declared in the current period do not include dividends declared in respect of prior-period unpaid cumulative dividends. Preferred dividends that are cumulative only if earned are deducted only to the extent that they are earned. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60B -URI http://asc.fasb.org/extlink&oid=7655603&loc=SL5780133-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60A -URI http://asc.fasb.org/extlink&oid=7655603&loc=SL5780132-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e2740-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 66 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e2814-109256 + Details
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