Earnings Per Common Share (Tables)

12 Months Ended

Dec. 31, 2012

Earnings Per Share [Abstract]

Computation Of Basic And Diluted Net Earnings Per Share

The computations of basic net earnings per share and diluted net earnings per share for 2012, 2011 and 2010 are as follows:

	Year ended December 31, 2012
	Income (Numerator)		Shares (Denominator)	Per-share Amount
Net income	$	44,214,000
Basic earnings per common share	$	44,214,000	67,511,000	$	0.65
Effect of dilutive securities:
Options			974,000	—
Diluted earnings per common share	$	44,214,000	68,485,000	$	0.65
	Year ended December 31, 2011
	Income (Numerator)		Shares (Denominator)	Per-share Amount
Net income	$	38,156,000
Basic earnings per common share	$	38,156,000	66,637,000	$	0.57
Effect of dilutive securities:
Options			948,000	(0.01		)
Diluted earnings per common share	$	38,156,000	67,585,000	$	0.56
	Year ended December 31, 2010
	Income (Numerator)		Shares (Denominator)	Per-share Amount
Net income	$	34,441,000
Basic earnings per common share	$	34,441,000	65,917,000	$	0.52
Effect of dilutive securities:
Options			1,091,000	(0.01		)
Diluted earnings per common share	$	34,441,000	67,008,000	$	0.51