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Stockholders' Equity Earnings Per Share (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Earnings Per Share [Abstract]
Weighted average number of shares outstanding - basic	53,212,759	51,226,898	52,546,647	51,563,090
Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements	1,489,700	1,494,766	1,399,123	1,537,018
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities	0	771,171	0	771,171
Weighted Average Number of Shares Outstanding, Diluted	54,702,459	53,492,835	53,945,770	53,871,279

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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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