Earnings Per Share (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Reconciliation of number of shares used in calculation of basic and diluted earning per share
Weighted average number of common shares outstanding	90,201,075	90,263,865	90,297,797	90,330,378
Effect of non-participatory equity compensation (in shares)	36,000	32,000	36,000	32,000
Weighted average number of common shares outstanding, including effect of dilutive securities	90,237,075	90,295,865	90,333,797	90,362,378