Earnings per Share (Weighted-Average Shares Outstanding for Computation of Basic and Diluted Income per Common Share) (Details) - shares	3 Months Ended			9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017		Sep. 30, 2018	Sep. 30, 2017
Earnings per Share [Abstract]
Basic method	173,047,246	172,572,873	[1]	172,949,450	172,509,418	[1]
Dilutive stock options and restricted stock units	1,128,021	0	[2]	1,252,310	0	[2]
Diluted method	174,175,267	172,572,873	[1]	174,201,760	172,509,418	[1]

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

[2] Due to a net loss in the three-month and nine-month periods ended September 30, 2017, no unvested stock awards were included in the computation of diluted earnings per shares because the effect would have been anti-dilutive.