| Summary Of Senior Unsecured Notes |  
		
			
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						September 30, | 
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						December 31, | 
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						Effective  | 
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						  | 
						  | 2013 | 
						  | 
						  | 2012 | 
						  | 
						Rate (1) | 
						  |  
				| 
						4.600% Senior Unsecured Notes, due June 15, 2013 (2) | 
						  | 
						  | 
						  - | 
						  | 
						$ | 99,987 | 
						  | 4.742 | 
						% |  
				| 
						5.125% Senior Unsecured Notes, due February 15, 2014 | 
						  | 
						$ | 200,090 | 
						  | 
						  | 200,270 | 
						  | 5.110 | 
						% |  
				| 
						5.125% Senior Unsecured Notes, due January 15, 2015 | 
						  | 
						  | 149,879 | 
						  | 
						  | 149,810 | 
						  | 5.297 | 
						% |  
				| 
						5.800% Senior Unsecured Notes, due January 15, 2016 | 
						  | 
						  | 200,180 | 
						  | 
						  | 200,237 | 
						  | 5.806 | 
						% |  
				| 
						2.500% Senior Unsecured Notes, due  December 15, 2017 | 
						  | 
						  | 248,781 | 
						  | 
						  | 248,560 | 
						  | 2.803 | 
						% |  
				| 
						7.750% Senior Unsecured Notes, due August 15, 2019 | 
						  | 
						  | 248,746 | 
						  | 
						  | 248,585 | 
						  | 8.017 | 
						% |  
				| 
						4.500% Senior Unsecured Notes, due April 18, 2022 | 
						  | 
						  | 299,490 | 
						  | 
						  | 299,445 | 
						  | 4.612 | 
						% |  
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						3.150% Senior Unsecured Notes, due May 15, 2023 | 
						  | 
						  | 269,171 | 
						  | 
						  | 
						  - | 
						  | 3.517 | 
						% |  
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						Total senior unsecured notes | 
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						$ | 1,616,337 | 
						  | 
						$ | 1,446,894 | 
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			(1)Includes the cost of terminated treasury lock agreements (if any), offering and other transaction costs and the discount/premium on the notes, as applicable.
		 
			(2)These notes were paid at maturity using available cash. 
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