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Computation of Basic and Diluted Income Per Common Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Earnings Per Share [Abstract]
Net income	$ 90,086	$ 62,294
Less: distributed and undistributed earnings allocated to participating securities	(1,402)	0
Net income attributable to common shareholders	$ 88,684	$ 62,294
Weighted average basic common shares outstanding	96,787	96,415
Effect of dilutive securities	36	1,001
Diluted common shares outstanding	96,823	97,416
Basic income per common share	$ 0.92	$ 0.65
Diluted income per common share	$ 0.92	$ 0.64

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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