CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
	Feb. 18, 2019	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
CONSOLIDATED STATEMENTS OF OPERATIONS
Net revenues		$ 331,035	$ 333,326	$ 333,532	$ 338,649	$ 344,750	$ 348,064	$ 350,221	$ 356,039	$ 1,336,542	$ 1,399,074	$ 1,059,574
Operating expense:
Cost of services and products (exclusive of depreciation and amortization)										574,936	611,872	445,998
Selling, general and administrative expenses										299,088	333,605	249,141
Acquisition and other transaction costs											1,960	33,650
Depreciation and amortization										381,237	432,668	291,873
Income from operations		26,719	23,542	14,300	16,720	3,555	748	5,427	9,239	81,281	18,969	38,912
Other income (expense):
Interest expense, net of interest income										(136,660)	(134,578)	(129,786)
Gain on extinguishment of debt										4,510
Investment income										38,088	39,596	31,749
Other, net										(10,864)	1,315	(503)
Loss before income taxes										(23,645)	(74,698)	(59,628)
Income tax benefit										(3,714)	(24,127)	(124,927)
Net income (loss)										(19,931)	(50,571)	65,299
Less: net income attributable to noncontrolling interest										452	263	354
Net income (loss) attributable to common shareholders		$ (5,988)	$ 257	$ (7,387)	$ (7,265)	$ (13,979)	$ (14,914)	$ (10,643)	$ (11,298)	$ (20,383)	$ (50,834)	$ 64,945
Net loss per common share - basic and diluted
Net income (loss) per basic and diluted common shares attributable to common shareholders		$ (0.08)		$ (0.10)	$ (0.11)	$ (0.20)	$ (0.21)	$ (0.15)	$ (0.16)	$ (0.29)	$ (0.73)	$ 1.07
Dividends declared per common share (in dollars per share)	$ 0.38738					$ 0.38738	$ 0.38738	$ 0.38738	$ 0.38738	$ 0.39	$ 1.55	$ 1.55