Interest Expense Interest Expense (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Interest expense	$ 18,141,000	$ 23,465,000	$ 61,449,000	$ 69,024,000
Amortization of deferred financing costs	698,000	1,043,000	2,576,000	3,501,000
Net unrealized loss (gain) on derivative financial instruments not designated as cash flow hedges	2,000	287,000	50,000	(1,264,000)
Derivative, Gain (Loss) on Derivative, Net	0	(135,000)	0	(135,000)
Capitalized interest	(8,258,000)	(5,681,000)	(23,211,000)	(14,863,000)
Interest Expense	$ 10,583,000	$ 18,979,000	$ 40,864,000	$ 56,263,000