Stock-Based Compensation (Summary Of RSU Activity Under The MSIP) (Details) - RSUs [Member]	12 Months Ended
	Dec. 31, 2019 $ / shares shares
RSUs
Total outstanding at the beginning of the period (in shares) | shares	526,744
Granted to employees (in shares) | shares	516,775
Vested (in shares) | shares	(227,616)
Forfeited (in shares) | shares	(122,977)
Total outstanding at the end of the period (in shares) | shares	692,926
Weighted Average Grant Date Fair Value
Total outstanding at the beginning of the period (in dollars per share) | $ / shares	$ 35.75
Granted to employees (in dollars per share) | $ / shares	42.11
Vested (in dollars per share) | $ / shares	33.45
Forfeited (in dollars per share) | $ / shares	41.02
Total outstanding at the end of the period (in dollars per share) | $ / shares	$ 40.11