Debt (Principal Payments Of Debt) (Details) (USD $)	9 Months Ended
	Sep. 30, 2012
Debt Instrument [Line Items]
2012 remaining	$ 127,624,000	[1]
2013	315,520,000
2014	474,292,000
2015	275,999,000
2016	231,661,000
2017	142,096,000
2018	64,441,000
2019	153,724,000	[2]
2020	3,746,000
2021	2,763,000
Thereafter	64,470,000
Total	1,856,336,000
3.95% Convertible Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Convertible senior unsecured notes	54,100,000
Debt instrument stated interest percentage	3.95%
Debt maturity date	2026
Debt Redemption Date	Nov. 08, 2012
8.1% Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Senior unsecured notes	$ 100,000,000
Debt instrument stated interest percentage	8.10%
Debt maturity date	2019
Debt redemption date	September 2014

[1] Includes $54.1 million of our 3.95% convertible senior unsecured notes outstanding due 2026, which were called by us with a redemption date of November 8, 2012.

[2] Includes $100.0 million of our 8.1% senior unsecured notes due 2019 which may be redeemed by us at any time on or after September 2014 at our option.