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Debt (Convertible AMS Notes Due 2036 And 2041) (Details) (USD $)			6 Months Ended
	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2011 3.25% AMS Convertible Notes Due 2036 [Member]	Jun. 30, 2011 4.00% AMS Convertible Notes Due 2041 [Member]
Notes, interest rate			3.25%	4.00%
Interest expense			$ 100,000	$ 100,000
Senior Notes gross	379,500,000	379,500,000	61,000,000	89,700,000
Stated conversion premium			1.5571	1.6940
Amount paid for redemption			1,600,000	271,600,000
Remaining principal amount			95,000,000	151,900,000
Convertible Notes, principal amount convertible			$ 1,000,000	$ 160,300,000

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date before deducting unamortized discount or premiums (if any). May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer.

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