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v3.10.0.1

Quarterly Results (unaudited) Correction of Prior Period Adjustment (Details) - USD ($) $ / shares in Units, $ 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
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Service revenue and other | $ 161,484 | $ 158,731 | $ 156,501 | $ 154,138 | $ 151,617 | $ 152,382 | $ 153,867 | $ 154,125 |  | $ 630,854 | $ 611,991 | $ 535,288 |
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
Deferred income taxes | 127,453 |  | 114,647 | 118,662 | 100,879 |  |  |  | 114,647 | 127,453 | 100,879 |  | 121,231
Retained earnings | 386,511 |  | 369,511 | 359,885 | 297,205 |  |  |  | 369,511 | 386,511 | 297,205 |  | 353,302
Income tax (benefit) expense |  |  | 3,531 | 1,828 |  |  |  |  | 5,359 | 15,517 | (53,133) | 2,840 |
Net income (loss) | $ 14,852 | $ 15,534 | $ 9,626 | $ 6,583 | $ 60,595 | $ 3,534 | $ (80) | $ 2,341 | $ 16,209 | $ 46,595 | $ 66,390 | $ (895) |
Basic net income (loss) per share (in dollars per share) | $ 0.31 | $ 0.31 | $ 0.19 | $ 0.13 | $ 1.23 | $ 0.07 | $ 0.00 | $ 0.05 | $ 0.33 | $ 0.94 | $ 1.35 | $ (0.02) |
Diluted income (loss) per share (in dollars per share) | $ 0.30 | $ 0.31 | $ 0.19 | $ 0.13 | $ 1.21 | $ 0.07 | $ 0.00 | $ 0.05 | $ 0.32 | $ 0.93 | $ 1.33 | $ (0.02) |
As Reported |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Prepaid expenses and other |  |  | $ 64,163 | $ 64,200 |  |  |  |  | $ 64,163 |  |  |  | 53,688
Deferred charges and other assets, net |  |  | 34,021 | 33,934 |  |  |  |  | 34,021 |  |  |  | 29,797
Deferred income taxes |  |  | 111,125 | 115,809 |  |  |  |  | 111,125 |  |  |  | 119,030
Retained earnings |  |  | 359,893 | 352,069 |  |  |  |  | 359,893 |  |  |  | 347,240
Income tax (benefit) expense |  |  | 2,862 | 1,176 |  |  |  |  | 4,038 |  |  |  |
Net income (loss) |  |  | $ 7,824 | $ 4,829 |  |  |  |  | $ 12,653 |  |  |  |
Basic net income (loss) per share (in dollars per share) |  |  | $ 0.16 | $ 0.10 |  |  |  |  | $ 0.26 |  |  |  |
Diluted income (loss) per share (in dollars per share) |  |  | $ 0.16 | $ 0.10 |  |  |  |  | $ 0.25 |  |  |  |
Immaterial error correction | Correction of Error |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Prepaid expenses and other |  |  | $ (4,756) | $ (5,741) |  |  |  |  | $ (4,756) |  |  |  | (6,701)
Deferred charges and other assets, net |  |  | 17,896 | 16,410 |  |  |  |  | 17,896 |  |  |  | 14,964
Deferred income taxes |  |  | 3,522 | 2,853 |  |  |  |  | 3,522 |  |  |  | 2,201
Retained earnings |  |  | 9,618 | 7,816 |  |  |  |  | 9,618 |  |  |  | $ 6,062
Income tax (benefit) expense |  |  | 669 | 652 |  |  |  |  | 1,321 |  |  |  |
Net income (loss) |  |  | $ 1,802 | $ 1,754 |  |  |  |  | $ 3,556 |  |  |  |
Basic net income (loss) per share (in dollars per share) |  |  | $ 0.03 | $ 0.03 |  |  |  |  | $ 0.07 |  |  |  |
Diluted income (loss) per share (in dollars per share) |  |  | $ 0.03 | $ 0.03 |  |  |  |  | $ 0.07 |  |  |  |
Service revenue and other |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Service revenue and other |  |  | $ 140,492 | $ 136,559 |  |  |  |  | $ 277,051 | $ 562,456 | $ 601,673 | $ 523,748 |
Service revenue and other | As Reported |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Service revenue and other |  |  | 138,021 | 134,153 |  |  |  |  | 272,174 |  |  |  |
Service revenue and other | Immaterial error correction | Correction of Error |  |  |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Service revenue and other |  |  | $ 2,471 | $ 2,406 |  |  |  |  | $ 4,877 |  |  |  |

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