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Revenue from Contracts with Customers - Adjustments to Previously Reported Consolidated Financial Statements from the Adoption of Accounting Pronouncements (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Jan. 01, 2018
Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Prepaid expenses and other | $ 60,162 |  | $ 59,407 | $ 58,459 | $ 17,111 |  |  |  | $ 59,407 | $ 60,162 | $ 17,111 |  | $ 46,987
Deferred charges and other assets, net | 49,891 |  | 51,917 | 50,344 | 13,690 |  |  |  | 51,917 | 49,891 | 13,690 |  | 44,761
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Advanced billings and customer deposits | 7,919 |  |  |  |  |  |  |  |  | 7,919 |  |  | 6,851
Deferred income taxes | 127,453 |  | 114,647 | 118,662 | 100,879 |  |  |  | 114,647 | 127,453 | 100,879 |  | 121,231
Other long-term liabilities | 14,364 |  |  |  | 15,293 |  |  |  |  | 14,364 | 15,293 |  | 14,093
Retained earnings | 386,511 |  | 369,511 | 359,885 | 297,205 |  |  |  | 369,511 | 386,511 | 297,205 |  | 353,302
Total operating revenue | 161,484 | $ 158,731 | 156,501 | 154,138 | 151,617 | $ 152,382 | $ 153,867 | $ 154,125 |  | 630,854 | 611,991 | $ 535,288 |
Selling, general and administrative |  |  |  |  |  |  |  |  |  | 113,222 | 165,937 | 133,325 |
Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Prepaid expenses and other | 22,204 |  |  |  | 17,111 |  |  |  |  | 22,204 | 17,111 |  |
Deferred charges and other assets, net | 12,083 |  |  |  | 13,690 |  |  |  |  | 12,083 | 13,690 |  |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Advanced billings and customer deposits | 24,414 |  |  |  | 21,153 |  |  |  |  | 24,414 | 21,153 |  |
Deferred income taxes | 103,404 |  |  |  | 100,879 |  |  |  |  | 103,404 | 100,879 |  |
Other long-term liabilities | 15,550 |  |  |  | 15,293 |  |  |  |  | 15,550 | 15,293 |  |
Retained earnings | 319,926 |  |  |  | $ 297,205 |  |  |  |  | 319,926 | 297,205 |  |
Selling, general and administrative |  |  |  |  |  |  |  |  |  | 175,753 |  |  |
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |
Prepaid expenses and other | 37,958 |  |  |  |  |  |  |  |  | 37,958 |  |  | 29,876
Deferred charges and other assets, net | 37,808 |  |  |  |  |  |  |  |  | 37,808 |  |  | 31,071
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Advanced billings and customer deposits | (16,495) |  |  |  |  |  |  |  |  | (16,495) |  |  | (14,302)
Deferred income taxes | 24,049 |  |  |  |  |  |  |  |  | 24,049 |  |  | 20,352
Other long-term liabilities | (1,186) |  |  |  |  |  |  |  |  | (1,186) |  |  | (1,200)
Retained earnings | $ 66,585 |  |  |  |  |  |  |  |  | 66,585 |  |  | $ 56,097
Selling, general and administrative |  |  |  |  |  |  |  |  |  | (62,531) |  |  |
Service revenue and other |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating revenue |  |  | $ 140,492 | $ 136,559 |  |  |  |  | $ 277,051 | 562,456 | 601,673 | 523,748 |
Service revenue and other | Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating revenue |  |  |  |  |  |  |  |  |  | 632,340 |  |  |
Service revenue and other | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating revenue |  |  |  |  |  |  |  |  |  | (69,884) |  |  |
Equipment revenue |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating revenue |  |  |  |  |  |  |  |  |  | 68,398 | 10,318 | 11,540 |
Equipment revenue | Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating revenue |  |  |  |  |  |  |  |  |  | 8,298 |  |  |
Equipment revenue | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating revenue |  |  |  |  |  |  |  |  |  | 60,100 |  |  |
Cost of services |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of services |  |  |  |  |  |  |  |  |  | 194,022 | 188,721 | 163,969 |
Cost of services | Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of services |  |  |  |  |  |  |  |  |  | 193,860 |  |  |
Cost of services | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of services |  |  |  |  |  |  |  |  |  | 162 |  |  |
Cost of goods sold |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of services |  |  |  |  |  |  |  |  |  | 63,959 | $ 22,786 | $ 29,551 |
Cost of goods sold | Calculated under Revenue Guidance in Effect before Topic 606 |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of services |  |  |  |  |  |  |  |  |  | 28,377 |  |  |
Cost of goods sold | Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of services |  |  |  |  |  |  |  |  |  | $ 35,582 |  |  |

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