Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer).

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Write-off of amounts previously capitalized as debt issuance cost in an extinguishment of debt.

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Indebtedness - Issuances and Principal Repayment (Details) - USD ($) $ in Thousands			6 Months Ended
	Mar. 11, 2016	Feb. 03, 2016	Jun. 30, 2016	Dec. 31, 2015
Indebtedness
Issuance of senior notes			$ 2,862,800	$ 2,403,439
Proceeds from issuance of senior notes, net of underwriting discounts and other offering expenses			737,612
Write off of Deferred Debt Issuance Cost			$ 70
Unsecured revolving credit facility
Indebtedness
Interest rate (as a percent)			1.56%
unsecured term loan
Indebtedness
Interest rate (as a percent)			1.66%
Senior unsecured notes
Indebtedness
Issuance of senior notes		$ 750,000
Proceeds from issuance of senior notes, net of underwriting discounts and other offering expenses		731,506
Senior Notes, due 2021 at 4.25 %
Indebtedness
Interest rate stated percentage			4.25%	4.25%
Senior Notes, due 2021 at 4.25 % \| Senior unsecured notes
Indebtedness
Issuance of senior notes		$ 400,000
Interest rate stated percentage		4.25%
Senior Unsecured Notes, due 2026 at 5.25%
Indebtedness
Interest rate stated percentage			5.25%	5.25%
Senior Unsecured Notes, due 2026 at 5.25% \| Senior unsecured notes
Indebtedness
Issuance of senior notes		$ 350,000
Interest rate stated percentage		5.25%
Senior Notes, due 2016 at 6.3%
Indebtedness
Interest rate stated percentage	6.30%		6.30%	6.30%
Principal balance of debt repaid	$ 275,000
Aggregate debt amount	$ 279,139
Write off of Deferred Debt Issuance Cost			$ 70