Earnings per Share (Weighted-Average Shares Outstanding for Computation of Basic and Diluted Income per Common Share) (Details) - shares		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016		Dec. 31, 2015
Earnings per Share [Abstract]
Basic method		172,524,061	172,173,012	[1]	174,351,227	[1]
Dilutive stock options	[2]
Diluted method		172,524,061	172,173,012	[1]	174,351,227	[1]

[1] Reclassified to conform to current presentation (see Note A).

[2] Due to a net loss recognized by the Company for the years ended December 31, 2017, 2016 and 2015, no unvested stock awards were included in the computation of diluted earnings per share because the effect would have been antidilutive.