Summary of Significant Accounting Policies (Basic and Diluted Earnings Per Share (in shares)) (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Accounting Policies [Abstract]
Weighted-average shares for basic EPS (in shares)	139,532,405	139,301,817	139,514,592	139,295,176
Plus incremental shares related to convertible debt (in shares)	0	0	1,380,717	0
Plus incremental shares related to stock options and non-vested restricted stock (in shares)	11,507	335,827	13,564	336,287
Weighted-average shares for diluted EPS (in shares)	139,543,912	139,637,644	140,908,873	139,631,463