Equity (Details) - Subsequent Event [Member] shares in Millions, $ in Millions	Oct. 10, 2017 USD ($) a shares
Class of Stock [Line Items]
Net acres acquired | a	6,600
Total acquisition cost	$ 38.0
Public Offering [Member]
Class of Stock [Line Items]
Sale of stock, consideration received	$ 208.7
Public Offering [Member] | Common Stock [Member]
Class of Stock [Line Items]
Sale of stock, shares of common stock issued (in shares) | shares	8.0