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Earnings Per Share (Excluded Securities On Diluted Shares Calculation) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Diluted	105,042	105,140	105,012	105,024
Debt Instrument, Convertible, Conversion Price	$ 32.14		$ 32.14
Convertible Senior Notes 2025 [Member]
Debt Instrument, Convertible, Stock Price Trigger			$ 38.57
Convertible Senior Notes 2032 [Member]
Debt Instrument, Convertible, Stock Price Trigger			$ 32.53
Convertible Senior Notes 2032 [Member]
Debt Instrument, Convertible, Conversion Price	$ 25.02		$ 25.02

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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