Long-term Incentive Compensation Plans (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2021	Sep. 30, 2020
Share-based Payment Arrangement [Abstract]
Units granted to employees and Eligible Directors (in units)	3,600,000	500,000
Units issued upon exercise of options (in units)	143,211	5,182
Proceeds from stock options exercised	$ 3,402	$ 147

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

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