Debt and Notes Payable - Related Party, Other Disclosures (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Debt Disclosure [Abstract]
Interest and debt expense incurred		$ 14,349	$ 8,653	$ 26,367	$ 17,045
Less: Capitalized interest		78	102	188	205
Interest and debt expense, net of capitalized interest	[1]	$ 14,271	$ 8,551	$ 26,179	$ 16,840

[1] Includes interest and debt expense – related party of $2,464 thousand and $2,343 thousand for the three months ended June 30, 2018 and 2017, respectively, and $5,310 thousand and $4,450 thousand for the six months ended June 30, 2018 and 2017, respectively.