Earnings Per Share (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Reconciliation of number of shares used in calculation of basic and diluted earnings per share
Weighted average number of common shares outstanding	90,200,000	90,400,000	90,200,000	90,400,000
Effect of non-participatory equity compensation (in shares)	36,000	36,000	36,000	36,000
Weighted average number of common shares outstanding, including effect of dilutive securities	90,200,000	90,400,000	90,300,000	90,400,000