Shareholders' Equity (Schedule Of Common Stock Outstanding Roll Forward) (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Shares issued:
Total shares issued at beginning of period			40,003,642
Shares cancelled, shares			(2,919,900)
Total shares issued at end of period	37,083,742		37,083,742
Treasury shares:
Treasury shares issued, balance at beginning of period			2,261,511
Shares repurchased, shares	605,898	0	2,942,085	969,163
Shares issued out of treasury			(602,512)
Shares cancelled, shares			(2,919,900)
Total treasury shares at end of period	1,681,184		1,681,184
Total shares outstanding at end of period	35,402,558		35,402,558		37,742,131