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Immaterial Restatement of Prior Period Financial Statements (Tables) | 9 Months Ended
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Sep. 30, 2019
Accounting Changes and Error Corrections [Abstract] |
Schedule of Error Corrections and Prior Period Adjustments | The corrections to the Company's Condensed Consolidated Statements of Income for the three and nine months ended September 30, 2018 were as follows: Condensed Consolidated Statements of Income
| For the three months ended September 30, 2018
| As Previously Reported |  | Corrections |  | As Corrected
| (In thousands, except per share data)
Operating revenue | $ | 218,983 |  |  | $ | 2,305 |  |  | $ | 221,288 |
Operating expenses: |  |  |  |  |  |  |  |
Income taxes | 11,262 |  |  | 524 |  |  | 11,786 |
Total operating expenses | 173,435 |  |  | 524 |  |  | 173,959 |
Net operating income | 45,548 |  |  | 1,781 |  |  | 47,329 |
Net income | $ | 34,392 |  |  | $ | 1,781 |  |  | $ | 36,173 |
Earnings per share: |  |  |  |  |  |  |  |
Basic | $ | 0.72 |  |  | $ | 0.03 |  |  | $ | 0.75 |
Diluted | $ | 0.72 |  |  | $ | 0.03 |  |  | $ | 0.75 |
| For the nine months ended September 30, 2018
| As Previously Reported |  | Corrections |  | As Corrected
| (In thousands, except per share data)
Operating revenue | $ | 523,862 |  |  | $ | 6,917 |  |  | $ | 530,779 |
Operating expenses: |  |  |  |  |  |  |  |
Income taxes | 15,380 |  |  | 1,570 |  |  | 16,950 |
Total operating expenses | 445,205 |  |  | 1,570 |  |  | 446,775 |
Net operating income | 78,657 |  |  | 5,347 |  |  | 84,004 |
Net income | $ | 44,869 |  |  | $ | 5,347 |  |  | $ | 50,216 |
Earnings per share: |  |  |  |  |  |  |
Basic | $ | 0.93 |  |  | $ | 0.11 |  |  | $ | 1.04 |
Diluted | $ | 0.93 |  |  | $ | 0.11 |  |  | $ | 1.04 |
The corrections to the Company's retained earnings and total stockholders’ equity as of January 1, 2018, March 31, 2018, June 30, 2018, and September 30, 2018 were as follows:
| January 1, 2018
| As Previously Reported |  | Corrections |  | As Corrected
| (In thousands)
Retained earnings | $ | 356,753 |  |  | $ | 5,759 |  |  | $ | 362,512 |
Total common stockholders' equity | 693,462 |  |  | 5,759 |  |  | 699,221 |
| March 31, 2018
| As Previously Reported |  | Corrections |  | As Corrected
| (In thousands)
Retained earnings | $ | 345,205 |  |  | $ | 7,542 |  |  | $ | 352,747 |
Total common stockholders' equity | 681,311 |  |  | 7,542 |  |  | 688,853 |
| June 30, 2018
| As Previously Reported |  | Corrections |  | As Corrected
| (In thousands)
Retained earnings | $ | 349,213 |  |  | $ | 9,325 |  |  | $ | 358,538 |
Total common stockholders' equity | 685,932 |  |  | 9,325 |  |  | 695,257 |
| September 30, 2018
| As Previously Reported |  | Corrections |  | As Corrected
| (In thousands)
Retained earnings | $ | 374,593 |  |  | $ | 11,106 |  |  | $ | 385,699 |
Total common stockholders' equity | 712,034 |  |  | 11,106 |  |  | 723,140 |
The corrections to the Company's Condensed Consolidated Statement of Cash Flows for the nine months ended September 30, 2018 were as follows: Condensed Consolidated Statement of Cash Flows
| For the nine months ended September 30, 2018
| As Previously Reported |  | Corrections |  | As Corrected
| (In thousands)
Operating activities: |  |  |  |  |  |  |
Net income | $ | 44,869 |  |  | $ | 5,347 |  |  | $ | 50,216 |
Other changes in noncurrent assets and liabilities | 5,991 |  |  | (5,347 | ) |  | 644 |
Net cash provided by operating activities | $ | 119,503 |  |  | $ | — |  |  | $ | 119,503 |

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- Definition Tabular disclosure of prior period adjustments to previously issued financial statements including (1) the effect of the correction on each financial statement line item and any per-share amounts affected for each prior period presented (2) the cumulative effect of the change on retained earnings or other appropriate components of equity or net assets in the statement of financial position, as of the beginning of the earliest period presented, and (3) the effect of the prior period adjustments (both gross and net of applicable income tax) on the net income of each prior period presented in the entity's annual report for the year in which the adjustments are made. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22663-107794 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22644-107794 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22658-107794 + Details
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