Performance Incentive Plan (Restricted Stock Activity) (Details) shares in Thousands	12 Months Ended
	Dec. 31, 2021 $ / shares shares
Number of Shares
Restricted shares granted (in shares) | shares	30,257
Weighted Average Share Price
Restricted shares granted (in dollars per share) | $ / shares	$ 40.28
Restricted stock
Number of Shares
Non-vested restricted shares, January 1 (in shares) | shares	896,044
Restricted shares granted (in shares) | shares	345,891
Restricted shares vested (in shares) | shares	(204,796)
Restricted shares forfeited (in shares) | shares	(58,684)
Non-vested restricted shares, December 31 (in shares) | shares	978,455
Weighted Average Share Price
Non-vested restricted shares, January 1 (in dollars per share) | $ / shares	$ 49.54
Restricted shares granted (in dollars per share) | $ / shares	42.30
Restricted shares vested (in dollars per share) | $ / shares	40.81
Restricted shares forfeited (in dollars per share) | $ / shares	37.36
Non-vested restricted shares, December 31 (in dollars per share) | $ / shares	$ 49.54