Accounting Policies - Earnings Per Share (Details) - shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounting Policies [Abstract]
Weighted average number of common shares used for basic EPS (in Shares)	36,554,437	37,651,492	38,692,658
Effect of dilutive stock options and restricted and deferred stock unit awards (in Shares)	0	0	389,684
Weighted average number of common shares and dilutive potential common stock used in dilutive EPS (in Shares)	36,554,437	37,651,492	39,082,342