Earnings Per Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Earnings Per Share (Details) [Abstract]
Number of anti-dilutive stock awards	2,478,460	1,302,773
Earnings Per Share (Table Details) [Abstract]
Net earnings	$ 28,857	$ 46,133
Basic weighted average shares	52,795,000	57,947,000
Effect of dilutive stock options	225,000	388,000
Diluted weighted average shares	53,020,000	58,335,000
Basic earnings per common share	$ 0.55	$ 0.80
Diluted earnings per common share	$ 0.54	$ 0.79