Long-Term Debt - Components Of Net Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Debt Disclosure [Abstract]
Interest expense	$ 7,394	$ 7,896
Interest income	(466)	(758)
Capitalized interest	(1,182)	(5,040)
Net interest expense	$ 5,746	$ 2,098