Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
REVENUES	$ 1,905,485	$ 1,980,689	$ 1,835,766
EXPENSES:
Operating	1,406,376	1,422,769	1,315,250
General and administrative	124,338	127,078	106,865
Depreciation and amortization	150,861	144,572	156,501
Contingent consideration for acquisition of businesses	620		6,085
Asset impairments	60,628	4,706	1,580
Costs and Expenses, Total	1,742,823	1,699,125	1,586,281
OPERATING INCOME	162,662	281,564	249,485
OTHER (INCOME) EXPENSE:
Interest expense, net	83,299	84,401	80,753
Expenses associated with debt repayments and refinancing transactions	7,141	602	1,016
Loss (gain) on sale of real estate assets	13,023	(287)
Other (income) expense	(525)	123	156
Total non-operating expense (income)	102,938	84,839	81,925
INCOME BEFORE INCOME TAXES	59,724	196,725	167,560
Income tax expense	(4,386)	(7,839)	(8,353)
NET INCOME	55,338	188,886	159,207
Net income attributable to non-controlling interest	(1,181)
NET INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS	$ 54,157	$ 188,886	$ 159,207
BASIC EARNINGS PER SHARE	$ 0.45	$ 1.59	$ 1.34
DILUTED EARNINGS PER SHARE	0.45	1.59	1.34
DIVIDENDS DECLARED PER SHARE	$ 0.44	$ 1.76	$ 1.72