Earnings Per Share (Basic and Diluted Earnings Per Share (in shares)) (Details) - shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Weighted-average shares for basic EPS	132,414,514	130,233,375	129,830,993
Plus incremental shares related to stock options and non-vested restricted stock	258,337	239,180	35,314
Weighted-average shares for diluted EPS	132,672,851	130,472,555	129,866,307