Stock-Based Compensation (Summary Of Stock-Based Awards) (Details) shares in Thousands	9 Months Ended
	Sep. 30, 2016 $ / shares shares
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested shares outstanding, shares or units, beginning balance | shares	467
Granted, shares or units | shares	319
Vested, shares or units | shares	(198)
Forfeited, shares or units | shares	(115)
Non-vested shares outstanding, shares or units, ending balance | shares	473
Non-vested outstanding, weighted-average grant date fair value, beginning balance | $ / shares	$ 21.59
Granted, weighted-average grant date fair value | $ / shares	21.5
Vested, weighted-average grant date fair value | $ / shares	21.09
Forfeited, weighted-average grant date fair value | $ / shares	21.86
Non-vested outstanding, weighted-average grant date fair value, ending balance | $ / shares	$ 21.67
Performance-Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested shares outstanding, shares or units, beginning balance | shares	306
Granted, shares or units | shares	184
Forfeited, shares or units | shares	(260)
Non-vested shares outstanding, shares or units, ending balance | shares	230
Non-vested outstanding, weighted-average grant date fair value, beginning balance | $ / shares	$ 19.77
Granted, weighted-average grant date fair value | $ / shares	21.63
Forfeited, weighted-average grant date fair value | $ / shares	19.62
Non-vested outstanding, weighted-average grant date fair value, ending balance | $ / shares	$ 21.44