Long-term Incentive Compensation Plans (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Share-based Payment Arrangement [Abstract]
Units granted to employees and Eligible Directors (in units)	100,000	100,000
Units issued upon exercise of options (in units)	5,182	300,000
Proceeds from stock options exercised	$ 147	$ 7,382

Number of share options (or share units) exercised during the current period.

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