Earnings Per Share (Anti-dilutive Shares) (Details) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Joint venture shares
Anti-dilutive shares
Anti-dilutive shares	0	[1]	298	[2]	298	[2]	298	[2]
3.00% convertible senior unsecured notes
Anti-dilutive shares
Anti-dilutive shares	0	[1]	16,992	[2]	16,992	[2]	16,992	[2]
Series J convertible perpetual preferred stock
Anti-dilutive shares
Anti-dilutive shares	0	[1]	15,635	[2]	15,635	[2]	15,635	[2]
1.50% convertible senior unsecured notes
Anti-dilutive shares
Anti-dilutive shares	0	[1]	0	[2]	11,567	[2]	0	[2]

[1] For the three months ended September 30, 2014, the effect of 21 unvested performance-based Units were anti-dilutive.

[2] For the nine months ended September 30, 2014 and for the three and nine months ended September 30, 2013, the effect of the Company's unvested Units and CSEs were anti-dilutive.