Financial Statements (Details) - USD ($) $ / shares in Units, $ in Thousands					6 Months Ended
	May 06, 2016	May 02, 2016	Feb. 24, 2016	Feb. 19, 2016	Jun. 30, 2016	Jun. 30, 2015
Class of Stock [Line Items]
Proceeds from sale of common stock in the Offering					$ 1,226,006	$ 0
Goldman, Sachs & Co.
Class of Stock [Line Items]
Number of shares purchased in the Offering				6,500,000
Share price (in dollars per share)				$ 58.50
Option to purchase common stock, period				30 days
Proceeds from sale of common stock in the Offering			$ 430,400
Goldman, Sachs & Co. \| Maximum
Class of Stock [Line Items]
Option to purchase additional common stock (in shares)				975,000
Credit Suisse Securities (USA) LLC and J.P. Morgan Securities LLC
Class of Stock [Line Items]
Number of shares purchased in the Offering		10,500,000
Share price (in dollars per share)		$ 67.00
Option to purchase common stock, period		30 days
Proceeds from sale of common stock in the Offering	$ 795,600
Credit Suisse Securities (USA) LLC and J.P. Morgan Securities LLC \| Maximum
Class of Stock [Line Items]
Option to purchase additional common stock (in shares)		1,575,000