| Summary Of Senior Unsecured Notes |  
		
			
		 
			
				| 
						 | 
						  | 
						  | 
						  | 
						  | 
						  | 
						  | 
						  | 
						  | 
						  |  
				| 
						 | 
						  | 
						  | 
						  | 
						  | 
						  | 
						  | 
						  | 
						  | 
						  |  
				| 
						 | 
						  | 
						  | 
						June 30, | 
						  | 
						  | 
						December 31, | 
						  | 
						Effective  | 
						  |  
				| 
						 | 
						  | 
						  | 
						2016 | 
						  | 
						  | 
						2015 | 
						  | 
						Rate (1) | 
						  |  
				| 
						5.800% Senior Unsecured Notes, due January 15, 2016 (2) | 
						  | 
						  | 
						  - | 
						  | 
						$ | 200,000 | 
						  | 5.806 | 
						% |  
				| 
						2.500% Senior Unsecured Notes, due  December 15, 2017 | 
						  | 
						$ | 250,000 | 
						  | 
						  | 250,000 | 
						  | 2.803 | 
						% |  
				| 
						7.750% Senior Unsecured Notes, due August 15, 2019 | 
						  | 
						  | 250,000 | 
						  | 
						  | 250,000 | 
						  | 8.017 | 
						% |  
				| 
						4.500% Senior Unsecured Notes, due April 18, 2022 | 
						  | 
						  | 300,000 | 
						  | 
						  | 300,000 | 
						  | 4.612 | 
						% |  
				| 
						3.150% Senior Unsecured Notes, due May 15, 2023 | 
						  | 
						  | 275,000 | 
						  | 
						  | 275,000 | 
						  | 3.517 | 
						% |  
				| 
						Principal balance outstanding | 
						  | 
						  | 1,075,000 | 
						  | 
						  | 1,275,000 | 
						  | 
						  | 
						  |  
				| 
						Adjustment for unamortized debt discount | 
						  | 
						  | (5,578) | 
						  | 
						  | (6,156) | 
						  | 
						  | 
						  |  
				| 
						Unamortized deferred financing costs | 
						  | 
						  | (4,480) | 
						  | 
						  | (5,062) | 
						  | 
						  | 
						  |  
				| 
						 | 
						  | 
						  | 
						  | 
						  | 
						  | 
						  | 
						  | 
						  | 
						  |  
				| 
						Total senior unsecured notes, net | 
						  | 
						$ | 1,064,942 | 
						  | 
						$ | 1,263,782 | 
						  | 
						  | 
						  | 
			
		 
			(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)On January 15, 2016, the Company repaid these notes at their maturity using proceeds from a new unsecured term loan and borrowings under the Company’s unsecured revolving credit facility.   
		 
			
		   |