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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2020
Summary of Significant Accounting Policies |
Activity in the allowance for doubtful accounts | A provision for doubtful accounts is recorded based on our judgment of the collectability of receivables. Amounts are written off when determined to be fully uncollectible. Delinquent accounts are based on contractual terms. The activity in the allowance for doubtful accounts during the years ended December 31, 2020, 2019 and 2018 was as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  |  | ​ |  |  | ​ |  |  | ​ |  | Write Off of |  |  | ​
​ | ​ | Balance | ​ | Charged to | ​ | Allowance | ​ | Uncollectible | ​ | Balance at
​ | ​ | at Beginning | ​ | Costs and | ​ | From | ​ | Accounts, Net of | ​ | End of
Year Ended |  | of Period |  | Expenses |  | Acquisitions |  | Recoveries |  | Period
​ | ​ | (in thousands)
December 31, 2020 | ​ | $ | 671 | ​ | $ | 420 | ​ | $ | — | ​ | $ | (443) | ​ | $ | 648
December 31, 2019 | ​ | $ | 759 | ​ | $ | 578 | ​ | $ | — | ​ | $ | (666) | ​ | $ | 671
December 31, 2018 | ​ | $ | 727 | ​ | $ | 444 | ​ | $ | 25 | ​ | $ | (437) | ​ | $ | 759
Property and equipment | Property and equipment consisted of the following: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Estimated |  | December 31,
​ |  | Useful Life |  | 2020 |  | 2019
​ | ​ | (In thousands)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Land and land improvements |  | ​ | — | ​ | $ | 14,559 | ​ | $ | 14,693
Buildings |  | ​ | 31.5 years | ​ |  | 38,059 | ​ |  | 37,984
Towers and antennae |  | ​ | 7-15 years | ​ |  | 25,976 | ​ |  | 24,762
Equipment |  | ​ | 3-15 years | ​ |  | 53,547 | ​ |  | 54,321
Furniture, fixtures and leasehold improvements |  | ​ | 7-20 years | ​ |  | 7,189 | ​ |  | 7,169
Vehicles |  | ​ | 5 years | ​ |  | 3,350 | ​ |  | 3,474
​ |  | ​ | ​ | ​ |  | 142,680 | ​ | ​ | 142,403
Accumulated depreciation |  | ​ | ​ | ​ |  | (87,795) | ​ |  | (83,692)
Net property and equipment | ​ | ​ | ​ | ​ | $ | 54,885 | ​ |  | 58,711
​
Schedule of Computation of Basic and Diluted Earnings Per Share | The following table sets forth the computation of basic and diluted earnings per share: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ | ​ | ​
​ |  | Years Ended December 31,
​ |  | 2020 |  | 2019 |  | 2018
​ |  | (In thousands, except per share data)
Numerator: | ​ | ​ |  |  | ​ |  | ​ | ​ |
Net income (loss) | ​ | $ | (1,913) | ​ | $ | 13,279 | ​ | $ | 13,690
Less: Income (loss) allocated to unvested participating securities | ​ |  | (21) | ​ |  | 292 | ​ | ​ | 256
Net income (loss) available to common stockholders | ​ | $ | (1,892) | ​ | $ | 12,987 | ​ | $ | 13,434
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Denominator: | ​ |  | ​ | ​ |  | ​ | ​ | ​ | ​
Denominator for basic earnings (loss) per share — weighted average shares | ​ |  | 5,871 | ​ |  | 5,834 | ​ | ​ | 5,829
Effect of dilutive securities: | ​ |  | ​ | ​ |  | ​ | ​ | ​ | ​
Common stock equivalents | ​ |  | — | ​ |  | — | ​ | ​ | —
Denominator for diluted earnings (loss) per share — adjusted weighted-average shares and assumed conversions | ​ |  | 5,871 | ​ |  | 5,834 | ​ | ​ | 5,829
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Earnings (loss) per share: | ​ |  | ​ | ​ |  | ​ | ​ | ​ | ​
Basic | ​ | $ | (0.32) | ​ | $ | 2.23 | ​ | $ | 2.30
Diluted | ​ | $ | (0.32) | ​ | $ | 2.23 | ​ | $ | 2.30
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​

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