Consolidated Statement of Operations and Comprehensive Income (Loss) - USD ($) $ in Thousands		3 Months Ended									6 Months Ended		9 Months Ended		12 Months Ended
		Dec. 31, 2019	[2]	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017
Net revenues:
Revenues from tenant contracts				$ 171,745	$ 168,189	$ 167,322	$ 167,332	$ 165,108	$ 164,056	$ 162,994	$ 335,511	$ 327,050	$ 507,256	$ 492,158	$ 678,150		$ 659,490		$ 616,897
Amortization of service revenues	[1]			13,436	12,764	12,171	11,974	10,846	10,604	10,067	24,935	20,671	38,371	31,517	52,341		43,491		38,435
Revenues		$ 184,864		185,181	180,953	179,493	179,306	175,954	174,660	173,061	360,446	347,721	545,627	523,675	730,491		702,981		655,332
Operating expenses:
Site rental costs of operations—third parties(b)	[3]			38,406	38,524	37,282	36,270	37,616	38,355	37,507		75,862	114,212	112,469	152,619		149,748		149,764
Site rental costs of operations—related parties(b)	[3]			10,880	10,721		11,512	10,163	9,700	9,606		19,306	32,210	30,478	43,281		40,981		36,655
Site rental costs of operations—total(b)	[3]			49,286	49,245		47,782	47,779	48,055	47,113		95,168	146,422	142,947	195,900	[1]	190,729	[1]	186,419	[1]
Management fee—related party				12,611	12,503		12,293	12,207	12,031	11,989		24,020	37,238	36,227	49,837		48,520		46,946
Asset write-down charges				0	185	190	249	0	0	344	375	344	375	344	1,050		593		181
Depreciation, amortization and accretion				51,881	51,626	51,580	51,707	51,684	52,083	52,054	103,206	104,137	155,087	155,821	207,396		207,528		207,764
Total operating expenses				113,778	113,559	111,785	112,031	111,670	112,169	111,500	225,344	223,669	339,122	335,339	454,183		447,370		441,310
Operating income (loss)		69,803		71,403	67,394	67,708	67,275	64,284	62,491	61,561	135,102	124,052	206,505	188,336	276,308		255,611		214,022
Interest expense and amortization of deferred financing costs															(39,874)		(39,874)		(39,874)
Other income (expense)				160	288	(3)	133	90	40	(67)	285	(27)	445	63	669		196		287
Income (loss) before income taxes				61,594	57,714	57,736	57,440	54,405	52,563	51,525	115,450	104,088	177,044	158,493	237,103		215,933		174,435
Benefit (provision) for income taxes		(119)		(102)	(107)	(98)	(137)	(93)	(93)	(93)	(205)	(186)	(307)	(279)	(426)		(416)		614
Net income (loss)		$ 59,940		$ 61,492	$ 57,607	$ 57,638	$ 57,303	$ 54,312	$ 52,470	$ 51,432	$ 115,245	$ 103,902	$ 176,737	$ 158,214	$ 236,677		$ 215,517		$ 175,049

[1] Represents the amortization of deferred revenues recorded in connection with the CCIC transactions described in note 2 that result in permanent improvements to the Company's towers. The Company receives no cash from, and is not party to, such transactions

[2] The sum of quarterly information may not agree to year-to-date information due to rounding. Resta

[3] Exclusive of depreciation, amortization and accretion shown separately and certain indirect costs included in the management fee.