Interest Expense Interest Expense (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest expense	$ 79,234,000	$ 91,651,000	$ 69,178,000
Amortization of deferred financing costs	3,217,000	4,661,000	3,011,000
Net unrealized loss (gain) on derivative financial instruments not designated as cash flow hedges	50,000	(926,000)	(1,348,000)
Derivative, Gain (Loss) on Derivative, Net	0	(135,000)	27,000
Capitalized interest	(29,806,000)	(20,804,000)	(12,727,000)
Interest Expense	$ 52,695,000	$ 74,447,000	$ 58,141,000