Debt (Principal Payments Of Debt) (Details) (USD $)	3 Months Ended	6 Months Ended
	Sep. 30, 2011	Jun. 30, 2011
2011 remaining		$ 161,171,000
2012		307,228,000
2013		315,094,000
2014		473,863,000
2015		245,603,000
2016		231,311,000
2017		142,119,000
2018		64,411,000
2019		153,747,000
2020		3,658,000
Thereafter		198,291,000	[1]
Total		2,296,496,000
3.95 % Convertible Senior Unsecured Notes [Member]
Convertible senior unsecured notes		131,300,000
Debt instrument stated interest percentage		3.95%
Debt maturity date		2026
Principal payments of debt	$ 77,200,000

[1] Includes $131.3 million of our 3.95% convertible senior unsecured notes outstanding due 2026, of which $77.2 million have been redeemed on August 1, 2011.