Earnings per Share (Weighted-Average Shares Outstanding for Computation of Basic and Diluted Income per Common Share) (Details) - shares		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings per Share [Abstract]
Basic method		172,557,978	172,196,914	172,482,223	172,149,791
Dilutive stock options and restricted stock units	[1]	0	602,913	534,441	0
Diluted method		172,557,978	172,799,827	173,016,664	172,149,791

[1] Due to net losses recognized by the Company for the three-month period ended June 30, 2017 and for the six-month period ended June 30, 2016, no unvested stock awards were included in the computation of diluted earnings per share because the effect would have been anti-dilutive.