Nature Of Operations And Significant Accounting Policies (Computation Of Basic And Diluted Earnings Per Share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended													12 Months Ended
	Dec. 31, 2011		Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010		Sep. 30, 2010		Jun. 30, 2010		Mar. 31, 2010		Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Nature Of Operations And Significant Accounting Policies [Abstract]
Net income attributable to common shareholders	$ (125,129)	[1]	$ 52,540	$ 50,437	$ 48,467	$ 39,388	[2]	$ 41,507	[3]	$ 40,041	[4]	$ 33,234	[5]	$ 26,315	$ 154,170	$ 133,856
Average basic shares outstanding														58,120	58,601	58,473
Effect of dilutive stock options														1,084	961	339
Average diluted shares outstanding														59,204	59,562	58,812
Basic earnings per share	$ (2.16)		$ 0.91	$ 0.87	$ 0.83	$ 0.67		$ 0.71		$ 0.68		$ 0.57		$ 0.45	$ 2.63	$ 2.29
Diluted earnings per share	$ (2.16)		$ 0.89	$ 0.85	$ 0.81	$ 0.66		$ 0.70		$ 0.67		$ 0.56		$ 0.44	$ 2.59	$ 2.28

[1] Includes the impact of item ( a ) cited above, net of tax.

[2] Includes the impact of item ( i ) cited above, net of tax and a $5,625 tax benefit caused by the reinvestment of non-U.S. earnings associated with the acquisition of Money Controls

[3] Includes the impact of item ( g ) cited above, net of tax.

[4] Includes the impact of item ( e ) cited above, net of tax.

[5] Includes the impact of item ( c ) cited above, net of tax.