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Earnings Per Share (Reconciliation Of Earnings Per Share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Earnings Per Share [Abstract]
Net income for basic and diluted earnings per share	$ 13,662	$ 10,498
Weighted average shares outstanding - basic	37,043	36,886
Dilutive effect of stock options and restricted stock	100	136
Weighted average shares outstanding - diluted	37,143	37,022
Earnings per share - basic	$ 0.37	$ 0.28
Earnings per share - diluted	$ 0.37	$ 0.28

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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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