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Quarterly Results (unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Schedule of Quarterly Financial Information | The following table reflects selected quarterly results for the Company.
| Three Months Ended
(in thousands, except per share data) | March 31, 2018 |  | June 30, 2018 |  | September 30, 2018 |  | December 31, 2018
Operating revenue | $ | 154,138 |  |  | $ | 156,501 |  |  | $ | 158,731 |  |  | $ | 161,484 |
Operating income (loss) | 16,754 |  |  | 21,169 |  |  | 28,329 |  |  | 26,994 |
Net income (loss) | 6,583 |  |  | 9,626 |  |  | 15,534 |  |  | 14,852 |
Net income (loss) per share - basic | $ | 0.13 |  |  | $ | 0.19 |  |  | $ | 0.31 |  |  | $ | 0.31 |
Net income (loss) per share - diluted | $ | 0.13 |  |  | $ | 0.19 |  |  | $ | 0.31 |  |  | $ | 0.30 |
| Three Months Ended
(in thousands except per share data) | March 31, 2017 |  | June 30, 2017 |  | September 30, 2017 |  | December 31, 2017
Operating revenue | $ | 154,125 |  |  | $ | 153,867 |  |  | $ | 152,382 |  |  | $ | 151,617 |
Operating income (loss) | 10,673 |  |  | 8,252 |  |  | 9,475 |  |  | 18,110 |
Net income (loss) | 2,341 |  |  | (80 | ) |  | 3,534 |  |  | 60,595 |
Net income (loss) per share - basic | $ | 0.05 |  |  | $ | — |  |  | $ | 0.07 |  |  | $ | 1.23 |
Net income (loss) per share - diluted | $ | 0.05 |  |  | $ | — |  |  | $ | 0.07 |  |  | $ | 1.21 |
Schedule of Error Corrections and Prior Period Adjustments | The cumulative effect of the adjustment made to the consolidated January 1, 2018 balance sheet for the adoption of the new revenue recognition standard was as follows:
| As of January 1, 2018
(in thousands) | As Reported |  | Correction of Error |  | As Adjusted
Prepaid expenses and other | $ | 53,688 |  |  | $ | (6,701 | ) |  | $ | 46,987 |
Deferred charges and other assets, net | 29,797 |  |  | 14,964 |  |  | 44,761 |
Deferred income taxes | 119,030 |  |  | 2,201 |  |  | 121,231 |
Retained earnings | 347,240 |  |  | 6,062 |  |  | 353,302 |
The following table presents the effects of the immaterial prior period adjustment on the unaudited condensed consolidated balance sheet as of March 31, 2018 and June 30, 2018:
| As of March 31, 2018
(in thousands) | As Reported |  | Correction of Error |  | As Adjusted
Prepaid expenses and other | $ | 64,200 |  |  | $ | (5,741 | ) |  | $ | 58,459 |
Deferred charges and other assets, net | 33,934 |  |  | 16,410 |  |  | 50,344 |
Deferred income taxes | 115,809 |  |  | 2,853 |  |  | 118,662 |
Retained earnings | 352,069 |  |  | 7,816 |  |  | 359,885 |
| As of June 30, 2018
(in thousands) | As Reported |  | Correction of Error |  | As Adjusted
Prepaid expenses and other | $ | 64,163 |  |  | $ | (4,756 | ) |  | $ | 59,407 |
Deferred charges and other assets, net | 34,021 |  |  | 17,896 |  |  | 51,917 |
Deferred income taxes | 111,125 |  |  | 3,522 |  |  | 114,647 |
Retained earnings | 359,893 |  |  | 9,618 |  |  | 369,511 |
The following tables present the effects of the immaterial prior period adjustment on the unaudited condensed consolidated statements of operations and comprehensive income (loss) for the three months ended March 31, 2018 and the three and six months ended June 30, 2018:
| For the Three Months Ended March 31, 2018
(in thousands) | As Reported |  | Correction of Error |  | As Adjusted
Service revenue and other | $ | 134,153 |  |  | $ | 2,406 |  |  | $ | 136,559 |
Income tax expense (benefit) | 1,176 |  |  | 652 |  |  | 1,828 |
Net income (loss) | 4,829 |  |  | 1,754 |  |  | 6,583 |
Earnings per share - basic | $ | 0.10 |  |  | $ | 0.03 |  |  | $ | 0.13 |
Earnings per share - diluted | $ | 0.10 |  |  | $ | 0.03 |  |  | $ | 0.13 |
| For the Three Months Ended June 30, 2018
(in thousands) | As Reported |  | Correction of Error |  | As Adjusted
Service revenue and other | $ | 138,021 |  |  | $ | 2,471 |  |  | $ | 140,492 |
Income tax expense (benefit) | 2,862 |  |  | 669 |  |  | 3,531 |
Net income (loss) | 7,824 |  |  | 1,802 |  |  | 9,626 |
Earnings per share - basic | $ | 0.16 |  |  | $ | 0.03 |  |  | $ | 0.19 |
Earnings per share - diluted | $ | 0.16 |  |  | $ | 0.03 |  |  | $ | 0.19 |
| For the Six Months Ended June 30, 2018
(in thousands) | As Reported |  | Correction of Error |  | As Adjusted
Service revenue and other | $ | 272,174 |  |  | $ | 4,877 |  |  | $ | 277,051 |
Income tax expense (benefit) | 4,038 |  |  | 1,321 |  |  | 5,359 |
Net income (loss) | 12,653 |  |  | 3,556 |  |  | 16,209 |
Earnings per share - basic | $ | 0.26 |  |  | $ | 0.07 |  |  | $ | 0.33 |
Earnings per share - diluted | $ | 0.25 |  |  | $ | 0.07 |  |  | $ | 0.32 |

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