Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2012

Earnings Per Share [Abstract]

Computations For Basic And Diluted Earnings Per Share From Continuing Operations

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2012		2011		2012		2011
Net income attributable to common shareholders of Great Lakes Dredge & Dock Corporation	$	4,437	$	1,706	$	5,505	$	4,098
Weighted-average common shares outstanding — basic		59,171		58,875		59,105		58,830
Effect of stock options and restricted stock units		363		309		388		398
Weighted-average common shares outstanding — diluted		59,534		59,184		59,493		59,228
Earnings per share — basic	$	0.07	$	0.03	$	0.09	$	0.07
Earnings per share — diluted	$	0.07	$	0.03	$	0.09	$	0.07