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Net Income (Los) Attributable to Controlling Interests Per Common Share Antidilutive Securities (Details) (USD $)	6 Months Ended			3 Months Ended		6 Months Ended
	Jun. 30, 2013 3.625% Convertible Senior Notes Due 2025 [Member]	May 31, 2012 3.625% Convertible Senior Notes Due 2025 [Member]	May 31, 2005 3.625% Convertible Senior Notes Due 2025 [Member]	Jun. 30, 2013 5.875% Convertible Senior Notes Due 2035 [Member]	Jun. 30, 2012 5.875% Convertible Senior Notes Due 2035 [Member]	Jun. 30, 2012 5.875% Convertible Senior Notes Due 2035 [Member]	Nov. 30, 2005 5.875% Convertible Senior Notes Due 2035 [Member]	May 31, 2005 5.875% Convertible Senior Notes Due 2035 [Member]
Debt Instrument [Line Items]
Shares potentially issuable and includible in diluted net loss attributable to controlling interest per common share (in shares)	0			0	0	0
Interest rate of convertible senior note (in hundredths)		3.625%	3.625%				5.875%	5.875%
Conversion price for convertible senior notes (in dollars per share)	$ 20.22			$ 24.61
Maximum potential dilution in future periods under the conversion provisions of convertible senior notes (in shares)	22,246			5,700,000

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Maximum potential additional shares which could be included in the calculation of diluted EPS in future periods as a result of the potentially dilutive effect of convertible debt securities using the if-converted method.

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The price per share of the conversion feature embedded in the debt instrument.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Interest rate stated in the contractual debt agreement.

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