Consolidated statements of operations - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenue:
Total revenue	$ 68,841	$ 61,268
Costs and expenses:
Operating	(26,637)	(25,325)
General and administrative expenses	(6,317)	(8,164)
Insurance expenses	(1,208)	(1,361)
Deferred compensation expense	(911)	(799)
Depreciation and amortization	(13,641)	(12,652)
Total costs and expenses	(48,714)	(48,301)
Earnings from unconsolidated affiliates	2,153	1,140
Operating income	22,280	14,107
Other expenses:
Interest expense	(9,214)	(8,842)
Amortization of deferred debt issuance costs	(643)	(750)
Total other expenses	(9,857)	(9,592)
Net earnings	12,423	4,515
External customers
Revenue:
Total revenue	61,669	53,767
Affiliate customers
Revenue:
Total revenue	$ 7,172	$ 7,501