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Earnings Per Common Share (Computation Of Basic And Diluted Net 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 [Abstract]
Net income	$ 14,639	$ 14,954
Basic earnings per common share, Income (Numerator)	14,639	14,954
Basic earnings per common share, Shares (Denominator)	70,321	68,463
Basic earnings per common share (dollars per share)	$ 0.21	$ 0.22
Effect of dilutive securities, Options, Shares	751	898
Effect of dilutive securities, Options, (dollars per share)	$ 0.00	$ 0.00
Diluted earnings per common share, Income (Numerator)	$ 14,639	$ 14,954
Diluted earnings per common share, Shares (Denominator)	71,072	69,361
Diluted earnings per common share (dollars per share)	$ 0.21	$ 0.22
Options outstanding to purchase common stock excluded from computation of diluted earnings per common share, Shares	993	544
Antidilutive securities excluded from earnings per share, average exercise price (dollars per share)	$ 25.87	$ 23.50

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Share Based Compensation Shares Authorized Under Stock Option Plan Exercise Price Range Exercisable Options Weighted Average Exercise Price

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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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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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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