Cash, Cash Equivalents, and Restricted Cash	12 Months Ended
	Dec. 31, 2021
Cash, Cash Equivalents, and Restricted Cash [Abstract]
Cash, Cash Equivalents, and Restricted Cash	4.CASH, CASH EQUIVALENTS, AND RESTRICTED CASHThe cash, cash equivalents, and restricted cash balances on the Consolidated Statements of Cash Flows consist of the following: As of As of As of December 31, 2021 December 31, 2020 December 31, 2019 Included on Balance Sheet (in thousands) Cash and cash equivalents $ 367,278  $ 308,560  $ 108,309  Securitization escrow accounts 64,764  31,507  30,046  Restricted cash - current assetPayment and performance bonds 797  164  197  Restricted cash - current assetSurety bonds and workers compensation 2,787  2,577  2,568  Other assets - noncurrentTotal cash, cash equivalents, and restricted cash $ 435,626  $ 342,808  $ 141,120  Pursuant to the terms of the Tower Securities (see Note 11), the Company is required to establish a securitization escrow account, held by the indenture trustee, into which all rents and other sums due on the towers that secure the Tower Securities are directly deposited by the lessees. These restricted cash amounts are used to fund reserve accounts for the payment of (1) debt service costs, (2) ground rents, real estate and personal property taxes and insurance premiums related to towers, (3) trustee and servicing expenses, and (4) management fees. The restricted cash in the securitization escrow account in excess of required reserve balances is subsequently released to the Borrowers (as defined in Note 11) monthly, provided that the Borrowers are in compliance with their debt service coverage ratio and that no event of default has occurred. All monies held by the indenture trustee are classified as restricted cash on the Company’s Consolidated Balance Sheets.Payment and performance bonds relate primarily to collateral requirements for tower construction currently in process by the Company. Cash is pledged as collateral related to surety bonds issued for the benefit of the Company or its affiliates in the ordinary course of business and primarily related to the Company’s tower removal obligations. As of December 31, 2021 and 2020, the Company had $42.3 million and $41.8 million in surety, payment and performance bonds, respectively, for which no collateral was required to be posted. The Company periodically evaluates the collateral posted for its bonds to ensure that it meets the minimum requirements. As of December 31, 2021 and 2020, the Company had also pledged $2.3 million as collateral related to its workers’ compensation policy.