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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		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Earnings Per Share [Abstract]
Net income	$ 13,921	$ 12,933	$ 28,560	$ 27,887
Basic earnings per common share, Income (Numerator)	13,921	12,933	28,560	27,887
Basic earnings per common share, Shares (Denominator)	70,440	68,599	70,381	68,531
Basic earnings per common share (dollars per share)	$ 0.20	$ 0.19	$ 0.41	$ 0.41
Effect of dilutive securities, Options, Shares	766	771	759	835
Effect of dilutive securities, Options, (dollars per share)	$ 0.00	$ 0.00	$ (0.01)	$ (0.01)
Diluted earnings per common share, Income (Numerator)	$ 13,921	$ 12,933	$ 28,560	$ 27,887
Diluted earnings per common share, Shares (Denominator)	71,206	69,370	71,140	69,366
Diluted earnings per common share (dollars per share)	$ 0.20	$ 0.19	$ 0.40	$ 0.40
Options outstanding to purchase common stock excluded from computation of diluted earnings per common share, Shares	578	552	785	548
Antidilutive securities excluded from earnings per share, average exercise price (dollars per share)	$ 27.56	$ 23.50	$ 26.49	$ 23.50

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