CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands		3 Months Ended				6 Months Ended
	Feb. 18, 2019	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
Net revenues		$ 325,176		$ 333,532		$ 650,838	$ 672,181
Operating expense:
Cost of services and products (exclusive of depreciation and amortization)		139,534		143,780		277,289	292,099
Selling, general and administrative expenses		64,796		78,148		132,613	152,515
Depreciation and amortization		81,066		97,304		163,804	196,547
Income from operations		39,780		14,300		77,132	31,020
Other income (expense):
Interest expense, net of interest income		(31,459)		(34,737)		(63,554)	(69,020)
Gain on extinguishment of debt				249		234	249
Investment income		9,180		10,750		19,759	19,351
Other, net		709		(1,652)		5,303	(3,021)
Income (loss) before income taxes		18,210		(11,090)		38,874	(21,421)
Income tax expense (benefit)		4,275		(3,778)		9,316	(6,923)
Net income (loss)		13,935	$ 15,623	(7,312)	$ (7,186)	29,558	(14,498)
Less: net income attributable to noncontrolling interest		95		75		171	154
Net income (loss) attributable to common shareholders		$ 13,840		$ (7,387)		$ 29,387	$ (14,652)
Net income (loss) per common share - basic and diluted
Net income (loss) per basic and diluted common shares attributable to common shareholders		$ 0.19		$ (0.10)		$ 0.40	$ (0.21)
Dividends declared per common share (in dollars per share)	$ 0.38738						$ 0.39