Summary of Significant Accounting Policies (Basic and Diluted Earnings Per Share (in shares)) (Details) - shares	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Accounting Policies [Abstract]
Weighted-average shares for basic EPS (in shares)	139,493,555	139,288,460
Plus incremental shares related to convertible debt (in shares)	2,776,775	0
Plus incremental shares related to stock options and non-vested restricted stock (in shares)	14,670	338,591
Weighted-average shares for diluted EPS (in shares)	142,285,000	139,627,051

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of convertible debt securities using the if-converted method.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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