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Segment Reporting - Selected Financial Data for Segments (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
External revenue        
Total revenue $ 169,526 $ 158,914 $ 322,714 $ 317,757
Operating expenses        
Selling, general and administrative 31,394 27,170 62,385 55,892
Depreciation and amortization 34,832 42,353 71,743 83,532
Total operating expenses 126,524 134,894 256,662 268,950
Operating income 43,002 24,020 66,052 48,807
Wireless        
External revenue        
Total revenue 119,749 111,119 223,887 223,740
Broadband        
External revenue        
Total revenue 47,948 46,044 95,201 90,503
Tower        
External revenue        
Total revenue 1,829 1,751 3,626 3,514
Operating Segments | Wireless        
External revenue        
Total revenue 119,749 111,119 223,887 223,740
Operating expenses        
Selling, general and administrative 9,783 10,318 19,211 21,397
Depreciation and amortization 23,420 31,463 48,719 61,833
Total operating expenses 75,877 90,191 156,571 178,599
Operating income 43,872 20,928 67,316 45,141
Operating Segments | Broadband        
External revenue        
Total revenue 50,133 48,551 99,919 95,432
Operating expenses        
Selling, general and administrative 9,260 7,524 18,759 15,093
Depreciation and amortization 11,245 10,002 22,116 19,993
Total operating expenses 41,366 36,671 81,122 73,503
Operating income 8,767 11,880 18,797 21,929
Operating Segments | Tower        
External revenue        
Total revenue 4,259 3,021 7,989 6,054
Operating expenses        
Selling, general and administrative 238 274 764 557
Depreciation and amortization 477 756 947 1,436
Total operating expenses 2,030 1,925 3,965 3,834
Operating income 2,229 1,096 4,024 2,220
Intersegment Eliminations        
External revenue        
Total revenue (4,615) (3,777) (9,081) (7,469)
Intersegment Eliminations | Wireless        
External revenue        
Total revenue 0 0 0 0
Intersegment Eliminations | Broadband        
External revenue        
Total revenue 2,185 2,507 4,718 4,929
Intersegment Eliminations | Tower        
External revenue        
Total revenue 2,430 1,270 4,363 2,540
Corporate, Non-Segment        
Operating expenses        
Selling, general and administrative 12,113 9,054 23,651 18,845
Depreciation and amortization (310) 132 (39) 270
Total operating expenses 7,251 6,107 15,004 13,014
Operating income (11,866) (9,884) (24,085) (20,483)
Postpaid        
External revenue        
Total revenue 73,269 75,997 148,197 152,179
Postpaid | Operating Segments | Wireless        
External revenue        
Total revenue 73,269 75,997 148,197 152,179
Postpaid | Operating Segments | Broadband        
External revenue        
Total revenue 0 0 0 0
Postpaid | Operating Segments | Tower        
External revenue        
Total revenue 0 0 0 0
Prepaid        
External revenue        
Total revenue 12,432 13,603 25,541 26,733
Prepaid | Operating Segments | Wireless        
External revenue        
Total revenue 12,432 13,603 25,541 26,733
Prepaid | Operating Segments | Broadband        
External revenue        
Total revenue 0 0 0 0
Prepaid | Operating Segments | Tower        
External revenue        
Total revenue 0 0 0 0
Tower lease        
External revenue        
Total revenue 1,829 1,751 3,626 3,514
Tower lease | Operating Segments | Wireless        
External revenue        
Total revenue 0 0 0 0
Tower lease | Operating Segments | Broadband        
External revenue        
Total revenue 0 0 0 0
Tower lease | Operating Segments | Tower        
External revenue        
Total revenue 1,829 1,751 3,626 3,514
Cable, residential and SMB        
External revenue        
Total revenue 35,829 33,581 70,772 66,007
Cable, residential and SMB | Operating Segments | Wireless        
External revenue        
Total revenue 0 0 0 0
Cable, residential and SMB | Operating Segments | Broadband        
External revenue        
Total revenue 35,829 33,581 70,772 66,007
Cable, residential and SMB | Operating Segments | Tower        
External revenue        
Total revenue 0 0 0 0
Fiber, enterprise and wholesale        
External revenue        
Total revenue 5,663 4,921 11,151 9,749
Fiber, enterprise and wholesale | Operating Segments | Wireless        
External revenue        
Total revenue 0 0 0 0
Fiber, enterprise and wholesale | Operating Segments | Broadband        
External revenue        
Total revenue 5,663 4,921 11,151 9,749
Fiber, enterprise and wholesale | Operating Segments | Tower        
External revenue        
Total revenue 0 0 0 0
Rural local exchange carrier        
External revenue        
Total revenue 4,602 5,581 9,358 10,819
Rural local exchange carrier | Operating Segments | Wireless        
External revenue        
Total revenue 0 0 0 0
Rural local exchange carrier | Operating Segments | Broadband        
External revenue        
Total revenue 4,602 5,581 9,358 10,819
Rural local exchange carrier | Operating Segments | Tower        
External revenue        
Total revenue 0 0 0 0
Travel, installation, and other        
External revenue        
Total revenue 26,096 6,625 31,263 16,289
Travel, installation, and other | Operating Segments | Wireless        
External revenue        
Total revenue 24,438 4,971 27,789 12,989
Travel, installation, and other | Operating Segments | Broadband        
External revenue        
Total revenue 1,658 1,654 3,474 3,300
Travel, installation, and other | Operating Segments | Tower        
External revenue        
Total revenue 0 0 0 0
Service revenue and other        
External revenue        
Total revenue 159,720 142,059 299,908 285,290
Service revenue and other | Operating Segments | Wireless        
External revenue        
Total revenue 110,139 94,571 201,527 191,901
Service revenue and other | Operating Segments | Broadband        
External revenue        
Total revenue 47,752 45,737 94,755 89,875
Service revenue and other | Operating Segments | Tower        
External revenue        
Total revenue 1,829 1,751 3,626 3,514
Equipment        
External revenue        
Total revenue 9,806 16,855 22,806 32,467
Equipment | Operating Segments | Wireless        
External revenue        
Total revenue 9,610 16,548 22,360 31,839
Equipment | Operating Segments | Broadband        
External revenue        
Total revenue 196 307 446 628
Equipment | Operating Segments | Tower        
External revenue        
Total revenue 0 0 0 0
Cost of services        
Operating expenses        
Cost of services and cost of goods sold 50,640 49,497 100,205 99,015
Cost of services | Operating Segments | Wireless        
Operating expenses        
Cost of services and cost of goods sold 33,237 32,668 66,676 65,200
Cost of services | Operating Segments | Broadband        
Operating expenses        
Cost of services and cost of goods sold 20,640 19,014 39,883 38,075
Cost of services | Operating Segments | Tower        
Operating expenses        
Cost of services and cost of goods sold 1,315 895 2,254 1,841
Cost of services | Corporate, Non-Segment        
Operating expenses        
Cost of services and cost of goods sold (4,552) (3,080) (8,608) (6,101)
Cost of goods sold        
Operating expenses        
Cost of services and cost of goods sold 9,658 15,874 22,329 30,511
Cost of goods sold | Operating Segments | Wireless        
Operating expenses        
Cost of services and cost of goods sold 9,437 15,742 21,965 30,169
Cost of goods sold | Operating Segments | Broadband        
Operating expenses        
Cost of services and cost of goods sold 221 131 364 342
Cost of goods sold | Operating Segments | Tower        
Operating expenses        
Cost of services and cost of goods sold 0 0 0 0
Cost of goods sold | Corporate, Non-Segment        
Operating expenses        
Cost of services and cost of goods sold $ 0 $ 1 $ 0 $ 0