Earnings Per Share Earnings Per Share (Details) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Unvested performance-based restricted stock units and associated dividend equivalent rights	308,000	361,000	308,000	361,000