Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2012

Computation of Basic EPS to Dilutive EPS

The following table reconciles the computation of basic EPS to dilutive EPS:

	Net Earnings (in thousands)		Weighted Average Shares		Per Share Amount
For the year ended December 31, 2012
Net earnings per share, basic	$	74,225		31,480,155	$	2.36
Effect of stock options		—		21,112		—
Net earnings per share, assuming dilution	$	74,225		31,501,267	$	2.36
For the year ended December 31, 2011:
Net earnings per share, basic	$	68,369		31,443,712	$	2.17
Effect of stock options		—		18,252		—
Net earnings per share, assuming dilution	$	68,369		31,461,964	$	2.17
For the year ended December 31, 2010:
Net earnings per share, basic	$	59,659		31,291,486	$	1.91
Effect of stock options		—		28,077		—
Net earnings per share, assuming dilution	$	59,659		31,319,563	$	1.91