Stock Based Compensation And Other Incentive Plans (Changes In Stock Options Outstanding And Not Yet Vested And Related Grant-Date Fair Value Under The Incentive Plan) (Details) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Stock Based Compensation And Other Incentive Plans [Abstract]
Unvested options at January 1	1,901
Granted, Common Shares	728
Vested, Common Shares	(746)
Cancelled, Common Shares	(87)
Unvested options at December 31	1,796
Unvested options at January 1, Weighted Average Grant-Date Fair Value	10.61
Granted , Weighted Average Grant-Date Fair Value	14.18
Vested, Weighted Average Grant-Date Fair Value	13.28
Canceled, Weighted Average Grant-Date Fair Value	10.35
Unvested options at December 31, Weighted Average Grant-Date Fair Value	10.96