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Fair Value Measurements | 12 Months Ended
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Dec. 31, 2018
Fair Value Measurements [Abstract] |
Fair Value Measurements | 3.FAIR VALUE MEASUREMENTS Items Measured at Fair Value on a Recurring Basis— The Company’s earnout liabilities related to business combinations are measured at fair value on a recurring basis using Level 3 inputs and are recorded in Accrued expenses in the accompanying Consolidated Balance Sheets. Changes in estimate s are recorded in Acquisition related adjustments and expenses in the accompanying Consolidated Statement of Operations. The Company determines the fair value of earnouts (contingent consideration) and any subsequent changes in fair value using a discounted probability-weighted approach using Level 3 inputs. Level 3 valuations rely on unobservable inputs for the asset or liability, and include situations where there is little, if any, market activity for the asset or liability. The fair value of the earnouts is reviewed quarterly and is based on the payments the Company expects to make based on historical internal observations related to the anticipated performance of the underlying assets. The Company’s estimate of the fair value of its obligation contained in acquisitions prior to January 1, 2017 (adoption of ASU 2017-01) was $0.5 million and $2.5 million as of December 31, 2018 and 2017, respectively. The maximum potential obligation related to the performance targets for these acquisitions was $0.7 million and $3.1 million as of December 31, 2018 and 2017, respectively. The maximum potential obligation related to the performance targets for acquisitions after January 1, 2017, which have not been recorded on the Company’s Consolidated Balance Sheet, w ere $13.3 million and $11.1 million as of December 31, 2018 and 2017. The Company’s asset retirement obligations are measured at fair value on a recurring basis using Level 3 inputs and are recorded in Other long-term liabilities in t he accompanying Consolidated Balance Sheets. The fair value of the asset retirement obligations is calculated using a discounted cash flow model. Items Measured at Fair Value on a Nonrecurring Basis— The Company’s long-lived and intangible assets are measured at fair value on a nonrecurring basis using Level 3 inputs. The Company considers many factors and makes certain assumptions when making this assessment, including but not limited to: general market and economic conditions, historical operating results, geographic location, lease-up potential and expected timing of lease-up. The fair value of the long-lived and intangible assets is calculated using a discounted cash flow model. Asset impairment and decommission costs for all periods presented and the related impaired assets primarily relate to the Company’s site leasing operating segment. The following summarizes the activity of asset impairment and decommission costs (in thousands): ﻿
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﻿ |  | For the year
﻿ |  | ended December 31,
﻿ |  | 2018 |  | 2017 |  | 2016
﻿ |  |  |  |  |  |  |  |
﻿Asset impairment (1) |  | $ | 14,350 |  | $ | 15,389 |  | $ | 19,217
﻿Write-off of carrying value of decommissioned towers |  |  | 10,795 |  |  | 16,861 |  |  | 12,967
﻿Gain on sale of fiber assets (2) |  |  | — |  |  | — |  |  | (8,919)
﻿Other (including third party decommission costs) |  |  | 1,989 |  |  | 4,447 |  |  | 6,977
﻿Total asset impairment and decommission costs |  | $ | 27,134 |  | $ | 36,697 |  | $ | 30,242
﻿ (1)Represents impairment charges resulting from the Company’s regular analysis of whether the future cash flows from certain towers are adequate to recover the carrying value of the investment in those towers. (2)Gain recognized on the sale of fiber assets acquired in the 2012 Mobilitie transaction. Fair Value of Financial Instruments— The carrying values of cash and cash equivalents, accounts receivable, restricted cash, accounts payable, and short-term investments approximate their estimated fair values due to the short maturity of these instruments. Short-term investments consisted of $0.2 million in Treasury securities as of December 31, 2018 and 2017. The Company’s estimate of the fair value of its held-to-maturity investments in treasury and corporate bonds, including current portion, are based primarily upon Level 1 reported market values. As of December 31, 2018, the carrying value and fair value of the held-to-maturity investments, including current portion, w ere $0.2 million. As of December 31, 2017, the carrying value and fair value of the held-to-maturity investments, including current portion, were $0.5 million. The current portion is recorded in Prepaid and other current assets in the accompanying Consolidated Balance Sheets, while held-to-maturity investments are recorded in Other a ssets. For the year ended December 31, 2018, the Company purchased $150.0 million and sold $150.2 million of short-term investments. The Company determines fair value of its debt instruments utilizing various Level 2 sources including quoted prices and indicative quotes (non-binding quotes) from brokers that require judgment to interpret market information including implied credit spreads for similar borrowings on recent trades or bid/ask prices. The fair value of the Revolving Credit Facility is considered to approximate the carrying value because the interest payments are based on Eurodollar rates that reset monthly or more frequently. The Company does not believe its credit risk has changed materially from the date the applicable Eurodollar Rate was set for the Revolving Credit Facility (112.5 to 175.0 basis points). Refer to Note 12 for the fair values, principal balances, and carrying values of the Company’s debt instruments.

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -URI http://asc.fasb.org/topic&trid=2155941 + Details
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