Share-Based Payments (Nonvested restricted stock activity) (Details) - Restricted Stock Units (RSUs)	12 Months Ended
	Dec. 31, 2021 $ / shares shares
RSUs
Nonvested, Beginning Balance (in shares) | shares	983,466
Granted (in shares) | shares	261,182
Vested (in shares) | shares	(393,575)
Reinvested dividend equivalents (in shares) | shares	4,528
Forfeited (in shares) | shares	(45,717)
Nonvested, Ending Balance (in shares) | shares	809,884
Weighted Average Grant Date Fair Value Per Share
Nonvested, Beginning Balance (in dollars per share) | $ / shares	$ 95.82
Granted (in dollars per share) | $ / shares	164.14
Vested (in dollars per share) | $ / shares	78.29
Reinvested dividend equivalents (in dollars per share) | $ / shares	116.78
Forfeited (in dollars per share) | $ / shares	115.19
Nonvested, Ending Balance (in dollars per share) | $ / shares	$ 125.71