Interest Expense (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Interest Expense [Abstract]
Interest expense before capitalized interest	$ 16,701,000	$ 22,877,000
Amortization of deferred financing costs	619,000	1,164,000
Net unrealized loss (gain) on derivative financial instruments not designated as cash flow hedges	(47,000)	48,000
Capitalized interest	(5,268,000)	(6,915,000)
Interest Expense	$ 12,005,000	$ 17,174,000