Summary of Significant Accounting Policies (Details Textual) - USD ($) shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other assets	$ 96,258,000		$ 96,258,000
Operating lease liability	102,323,000		$ 102,323,000
Discount rate, present value of future revenue			10.00%
Impairment charges		$ 0
Capitalized general and administrative costs	8,300,000	8,500,000	$ 25,100,000	$ 22,600,000
Interest costs capitalized	$ 2,700,000	$ 1,700,000	$ 7,000,000.0	$ 6,200,000
Restricted Stock
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Antidilutive securities (in shares)	2.5		2.7
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other assets	$ 62,300,000		$ 62,300,000
Operating lease liability	$ 62,300,000		$ 62,300,000