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Equity - General Information (Details) $ / shares in Units, $ in Thousands							3 Months Ended					12 Months Ended
	May 15, 2018 $ / shares	Apr. 02, 2018 USD ($) $ / shares shares	Feb. 15, 2018	Mar. 30, 2017 USD ($)	Jun. 24, 2016 USD ($)	Feb. 16, 2016 USD ($)	Mar. 31, 2019 USD ($) site $ / shares shares	Dec. 31, 2018 $ / shares	Sep. 30, 2018 $ / shares	Jun. 30, 2018 $ / shares	Mar. 31, 2018 USD ($) site $ / shares shares	Dec. 31, 2018 USD ($) site	Mar. 10, 2016 shares
Partnership Equity
Number of tenant sites acquired \| site												104
Common Units Issued to Landmark and Affiliates												$ 7,700
Proceeds from the issuance of Preferred Units, net											$ 603
Quarterly distributions
Conversion ratio of subordinated units into common units			100.00%
Wireless Communication
Partnership Equity
Number of tenant sites acquired \| site												49
Preferred Units Series A
Partnership Equity
Distribution date							Apr. 15, 2019	Jan. 15, 2019	Oct. 15, 2018	Jul. 16, 2018	Apr. 16, 2018
Distribution Per Unit Paid (in dollars per share) \| $ / shares							$ 0.5000	$ 0.5000	$ 0.5000	$ 0.5000	$ 0.5000
Preferred Units Series B
Partnership Equity
Distribution date							May 15, 2019	Feb. 15, 2019	Nov. 15, 2018	Aug. 15, 2018	May 15, 2018
Distribution Per Unit Paid (in dollars per share) \| $ / shares							$ 0.4938	$ 0.4938	$ 0.4938	$ 0.4938	$ 0.4938
Preferred Units Series C
Partnership Equity
Distribution date							May 15, 2019	Feb. 15, 2019	Nov. 15, 2018	Aug. 15, 2018
Distribution Per Unit Paid (in dollars per share) \| $ / shares							$ 0.4614	$ 0.4571	$ 0.4382	$ 0.4400
Stated liquidation preference / redemption price (in dollars per share) \| $ / shares							$ 25.00
Conversion rate for preferred unit \| shares							1.3017
Designated redemption date one							May 15, 2025
Designated redemption date two							May 15, 2028
Designated redemption period							5 years
Liquidation preference \| $ / shares							$ 11.13
Preferred units redemption date							May 20, 2025
Preferred units redemption price \| $ / shares							$ 25.00
At The Market Issuance Sales Agreement \| Preferred Units
Partnership Equity
Aggregate offering price					$ 40,000
Unit Exchange Program
Partnership Equity
Remaining common units available to be issued \| shares							4,091,908
Unit Exchange Program \| 6-site acquisition \| Wireless Communication
Partnership Equity
Number of tenant sites acquired \| site							0				6
Common Units Issued to Landmark and Affiliates											$ 3,200
Limited Partners \| Common Units
Partnership Equity
Issuance of units, net (in shares) \| shares											1,721,000
Quarterly distributions
Minimum quarterly distribution per unit (in dollars per share) \| $ / shares							$ 0.2875
Limited Partners \| Preferred Units Series A
Partnership Equity
Issuance of units, net (in shares) \| shares											25,000
Limited Partners \| Preferred Units Series C
Partnership Equity
Distribution date							May 15, 2018
Distribution Per Unit Paid (in dollars per share) \| $ / shares	$ 0.2090
Limited Partners \| Preferred Units Series C \| Distributions Accruing After May 15, 2025
Partnership Equity
Dividend rate (as a percent)							9.00%
Limited Partners \| Preferred Units Series C \| Three-month LIBOR \| Distributions Accruing Before May 15, 2025
Partnership Equity
Dividend rate (as a percent)							4.698%
Stated liquidation preference / redemption price (in dollars per share) \| $ / shares							$ 25.00
Limited Partners \| Preferred Units Series C \| Minimum \| Distributions Accruing Before May 15, 2025
Partnership Equity
Dividend rate (as a percent)							7.00%
Limited Partners \| At The Market Issuance Sales Agreement \| Common Units
Partnership Equity
Aggregate offering price						$ 50,000
Issuance of units, net (in shares) \| shares							0				27,830
Proceeds from issuance of unit, before costs											$ 500
Limited Partners \| At The Market Issuance Sales Agreement \| Preferred Units Series A
Partnership Equity
Issuance of units, net (in shares) \| shares							0				24,747
Proceeds from issuance of unit, before costs											$ 600
Limited Partners \| At The Market Issuance Sales Agreement \| Preferred Units Series B
Partnership Equity
Aggregate offering price				$ 50,000
Issuance of units, net (in shares) \| shares							0				0
Remaining available amount to be issued							$ 34,400
Limited Partners \| Unit Exchange Program \| Common Units
Partnership Equity
Units authorized (in units) \| shares													5,000,000
Limited Partners \| Unit Exchange Program \| Common Units \| 6-site acquisition \| Wireless Communication
Partnership Equity
Number of common units in connection with acquisition (in shares) \| shares											185,898
Limited Partners \| Public Offering \| Preferred Units Series C
Partnership Equity
Issuance of units, net (in shares) \| shares		2,000,000
Unit offering price (in dollars per share) \| $ / shares		$ 25.00
Proceeds from the issuance of Preferred Units, net		$ 47,500
Offering expenses paid		$ 2,500