Debt And Capital Lease Obligations (Convertible Debentures) (Details) (USD $)			3 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 5.75% Junior Subordinated Convertible Debentures [Member]	Dec. 31, 2009 5.75% Junior Subordinated Convertible Debentures [Member]	Sep. 30, 2013 4.875% Unsecured Senior Notes [Member]	Dec. 31, 2009 4.875% Unsecured Senior Notes [Member]
Debt Instrument
Terms of exchange offer				$ 1,020		$ 1,000
Debt Instrument, Face Amount			125,000,000
Debt Instrument, Interest Rate, Stated Percentage			5.75%			4.875%
Debt Instrument, Maturity Date			Sep. 15, 2029			Dec. 15, 2009
Extinguishment of Debt, Amount					122,500,000
Liability component of convertible debt recognized at issuance				56,300,000
Deferred tax impact on convertible debt	$ 138,500,000	$ 136,500,000		$ 32,700,000
Debt Instrument, Convertible, Conversion Price			$ 11.84	$ 12.07
Debt Instrument, Convertible, Conversion Ratio			84.46	82.82
Debt Instrument, Convertible, Terms of Conversion Feature				1000
Contingent Interest			0.0075