Earnings Per Share (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Average common shares outstanding (in shares)	124,770	124,256	124,480	124,011
Effect of dilutive securities - share-based compensation (in shares)	0	794	0	835
Average shares for diluted computations	124,770	125,050	124,480	124,846
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive shares	2,507	1,092	3,074	1,092
Share Options and Appreciation Rights [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive shares	1,339	1,092	1,372	1,092
Restricted share units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total potentially dilutive shares	1,168	0	1,702	0