Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 16, 2017	Dec. 31, 2016	May 09, 2016
Subsidiary, Sale of Stock [Line Items]
Class A common stock, par value (in dollars per share)	$ 0.01		$ 0.01	$ 0.01
Equity Distribution Agreement Maximum Aggregate Sales Price				$ 200.0
Shares Sold Under the Equity Distribution Agreement	0
Equity Distribution Agreement Remaining Aggregate Sales Available	$ 170.8
Class B membership interests in Panhandle 2 Holdings [Member]
Subsidiary, Sale of Stock [Line Items]
Ownership percentage to be sold		49.00%
Consideration for sale of project interests		$ 58.8