Segment Information (Details) (USD $) | 3 Months Ended | 6 Months Ended | |
In Thousands, unless otherwise specified | Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013 |
| State | Segment |
| | State |
Segment Information [Abstract] | ' | ' | ' | ' | ' |
Number of reportable segments | ' | ' | 3 | ' | ' |
Non Sprint operations, number of states | 4 | ' | 4 | ' | ' |
Financial data for each segment [Abstract] | ' | ' | ' | ' | ' |
Service revenues | $70,404 | $68,245 | $140,160 | $133,935 | ' |
Other revenues | 11,012 | 9,209 | 21,708 | 19,528 | ' |
Total external revenues | 81,416 | 77,454 | 161,868 | 153,463 | ' |
Internal revenues | 0 | 0 | 0 | 0 | ' |
Total operating revenues | 81,416 | 77,454 | 161,868 | 153,463 | ' |
Operating expenses [Abstract] | ' | ' | ' | ' | ' |
Cost of goods and services, exclusive of depreciation and amortization shown separately below | 32,403 | 30,528 | 64,639 | 61,229 | ' |
Selling, general and administrative, exclusive of depreciation and amortization shown separately below | 16,625 | 16,355 | 33,773 | 32,484 | ' |
Depreciation and amortization | 16,595 | 16,071 | 31,983 | 30,042 | ' |
Total operating expenses | 65,623 | 62,954 | 130,395 | 123,755 | ' |
Operating income (loss) | 15,793 | 14,500 | 31,473 | 29,708 | ' |
Reconciliation of income from continuing operations from segments to consolidated [Abstract] | ' | ' | ' | ' | ' |
Total consolidated operating income | 15,793 | 14,500 | 31,473 | 29,708 | ' |
Interest expense | -2,065 | -2,068 | -4,112 | -4,220 | ' |
Non-operating income (expense), net | 573 | 488 | 1,182 | 1,157 | ' |
Income before taxes | 14,301 | 12,920 | 28,543 | 26,645 | ' |
Assets by segment [Abstract] | ' | ' | ' | ' | ' |
Assets | 604,003 | ' | 604,003 | ' | 597,006 |
Wireless [Member] | ' | ' | ' | ' | ' |
Assets by segment [Abstract] | ' | ' | ' | ' | ' |
Assets | 233,637 | ' | 233,637 | ' | 229,038 |
Cable [Member] | ' | ' | ' | ' | ' |
Assets by segment [Abstract] | ' | ' | ' | ' | ' |
Assets | 208,092 | ' | 208,092 | ' | 199,184 |
Wireline [Member] | ' | ' | ' | ' | ' |
Assets by segment [Abstract] | ' | ' | ' | ' | ' |
Assets | 89,487 | ' | 89,487 | ' | 92,455 |
Other [Member] | ' | ' | ' | ' | ' |
Assets by segment [Abstract] | ' | ' | ' | ' | ' |
Assets | 417,790 | ' | 417,790 | ' | 435,804 |
Total Segments [Member] | ' | ' | ' | ' | ' |
Assets by segment [Abstract] | ' | ' | ' | ' | ' |
Assets | 949,006 | ' | 949,006 | ' | 956,481 |
Reportable Segments [Member] | Wireless [Member] | ' | ' | ' | ' | ' |
Financial data for each segment [Abstract] | ' | ' | ' | ' | ' |
Service revenues | 47,868 | 46,362 | 95,100 | 90,427 | ' |
Other revenues | 2,813 | 2,328 | 5,569 | 5,347 | ' |
Total external revenues | 50,681 | 48,690 | 100,669 | 95,774 | ' |
Internal revenues | 1,094 | 1,076 | 2,184 | 2,149 | ' |
Total operating revenues | 51,775 | 49,766 | 102,853 | 97,923 | ' |
Operating expenses [Abstract] | ' | ' | ' | ' | ' |
Cost of goods and services, exclusive of depreciation and amortization shown separately below | 18,476 | 17,854 | 37,132 | 35,385 | ' |
Selling, general and administrative, exclusive of depreciation and amortization shown separately below | 7,657 | 8,068 | 16,089 | 15,955 | ' |
Depreciation and amortization | 8,071 | 7,781 | 15,268 | 13,809 | ' |
Total operating expenses | 34,204 | 33,703 | 68,489 | 65,149 | ' |
Operating income (loss) | 17,571 | 16,063 | 34,364 | 32,774 | ' |
Reconciliation of income from continuing operations from segments to consolidated [Abstract] | ' | ' | ' | ' | ' |
Total consolidated operating income | 17,571 | 16,063 | 34,364 | 32,774 | ' |
Reportable Segments [Member] | Cable [Member] | ' | ' | ' | ' | ' |
Financial data for each segment [Abstract] | ' | ' | ' | ' | ' |
Service revenues | 17,416 | 16,325 | 34,840 | 32,487 | ' |
Other revenues | 3,388 | 2,357 | 6,418 | 4,659 | ' |
Total external revenues | 20,804 | 18,682 | 41,258 | 37,146 | ' |
Internal revenues | 33 | 53 | 59 | 102 | ' |
Total operating revenues | 20,837 | 18,735 | 41,317 | 37,248 | ' |
Operating expenses [Abstract] | ' | ' | ' | ' | ' |
Cost of goods and services, exclusive of depreciation and amortization shown separately below | 12,421 | 11,239 | 24,811 | 22,461 | ' |
Selling, general and administrative, exclusive of depreciation and amortization shown separately below | 4,735 | 4,500 | 9,381 | 8,924 | ' |
Depreciation and amortization | 5,766 | 5,479 | 11,170 | 10,684 | ' |
Total operating expenses | 22,922 | 21,218 | 45,362 | 42,069 | ' |
Operating income (loss) | -2,085 | -2,483 | -4,045 | -4,821 | ' |
Reconciliation of income from continuing operations from segments to consolidated [Abstract] | ' | ' | ' | ' | ' |
Total consolidated operating income | -2,085 | -2,483 | -4,045 | -4,821 | ' |
Reportable Segments [Member] | Wireline [Member] | ' | ' | ' | ' | ' |
Financial data for each segment [Abstract] | ' | ' | ' | ' | ' |
Service revenues | 5,120 | 5,558 | 10,220 | 11,021 | ' |
Other revenues | 4,811 | 4,524 | 9,721 | 9,522 | ' |
Total external revenues | 9,931 | 10,082 | 19,941 | 20,543 | ' |
Internal revenues | 5,713 | 5,169 | 11,478 | 9,808 | ' |
Total operating revenues | 15,644 | 15,251 | 31,419 | 30,351 | ' |
Operating expenses [Abstract] | ' | ' | ' | ' | ' |
Cost of goods and services, exclusive of depreciation and amortization shown separately below | 7,737 | 7,198 | 15,219 | 14,364 | ' |
Selling, general and administrative, exclusive of depreciation and amortization shown separately below | 1,493 | 1,251 | 2,737 | 2,612 | ' |
Depreciation and amortization | 2,653 | 2,802 | 5,350 | 5,532 | ' |
Total operating expenses | 11,883 | 11,251 | 23,306 | 22,508 | ' |
Operating income (loss) | 3,761 | 4,000 | 8,113 | 7,843 | ' |
Reconciliation of income from continuing operations from segments to consolidated [Abstract] | ' | ' | ' | ' | ' |
Total consolidated operating income | 3,761 | 4,000 | 8,113 | 7,843 | ' |
Reportable Segments [Member] | Other [Member] | ' | ' | ' | ' | ' |
Financial data for each segment [Abstract] | ' | ' | ' | ' | ' |
Service revenues | 0 | 0 | 0 | 0 | ' |
Other revenues | 0 | 0 | 0 | 0 | ' |
Total external revenues | 0 | 0 | 0 | 0 | ' |
Internal revenues | 0 | 0 | 0 | 0 | ' |
Total operating revenues | 0 | 0 | 0 | 0 | ' |
Operating expenses [Abstract] | ' | ' | ' | ' | ' |
Cost of goods and services, exclusive of depreciation and amortization shown separately below | 0 | 0 | 0 | 0 | ' |
Selling, general and administrative, exclusive of depreciation and amortization shown separately below | 3,349 | 3,071 | 6,764 | 6,071 | ' |
Depreciation and amortization | 105 | 9 | 195 | 17 | ' |
Total operating expenses | 3,454 | 3,080 | 6,959 | 6,088 | ' |
Operating income (loss) | -3,454 | -3,080 | -6,959 | -6,088 | ' |
Reconciliation of income from continuing operations from segments to consolidated [Abstract] | ' | ' | ' | ' | ' |
Total consolidated operating income | -3,454 | -3,080 | -6,959 | -6,088 | ' |
Eliminations [Member] | ' | ' | ' | ' | ' |
Financial data for each segment [Abstract] | ' | ' | ' | ' | ' |
Service revenues | 0 | 0 | 0 | 0 | ' |
Other revenues | 0 | 0 | 0 | 0 | ' |
Total external revenues | 0 | 0 | 0 | 0 | ' |
Internal revenues | -6,840 | -6,298 | -13,721 | -12,059 | ' |
Total operating revenues | -6,840 | -6,298 | -13,721 | -12,059 | ' |
Operating expenses [Abstract] | ' | ' | ' | ' | ' |
Cost of goods and services, exclusive of depreciation and amortization shown separately below | -6,231 | -5,763 | -12,523 | -10,981 | ' |
Selling, general and administrative, exclusive of depreciation and amortization shown separately below | -609 | -535 | -1,198 | -1,078 | ' |
Depreciation and amortization | 0 | 0 | 0 | 0 | ' |
Total operating expenses | -6,840 | -6,298 | -13,721 | -12,059 | ' |
Operating income (loss) | 0 | 0 | 0 | 0 | ' |
Reconciliation of income from continuing operations from segments to consolidated [Abstract] | ' | ' | ' | ' | ' |
Total consolidated operating income | 0 | 0 | 0 | 0 | ' |
Assets by segment [Abstract] | ' | ' | ' | ' | ' |
Assets | ($345,003) | ' | ($345,003) | ' | ($359,475) |