Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2014	Mar. 31, 2013
Earnings per share - Basic:
Earnings from continuing operations	$ 49,098	$ 40,802
Less: Distributed and undistributed earnings allocated to nonvested stock	(255)	(403)
Earnings from continuing operations available to common shareholders - Basic	48,843	40,399
Weighted average common shares outstanding - Basic	52,660	50,958
Earnings from continuing operations per common share - Basic	$ 0.93	$ 0.79
Earnings per share - Diluted:
Earnings from continuing operations	49,098	40,802
Less: Distributed and undistributed earnings allocated to nonvested stock	(255)	(403)
Earnings from continuing operations available to common shareholders - Diluted	$ 48,843	$ 40,399
Weighted average common shares outstanding - Basic	52,660	50,958
Effect of dilutive equity awards	463	435
Weighted average common shares outstanding - Diluted	53,123	51,393
Earnings from continuing operations per common share - Diluted	$ 0.92	$ 0.79
Anti-dilutive equity awards not included above	215	1,413

Basic earnings from continuing operations after adjustments for earnings allocable to nonvested stock.

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Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

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