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v3.19.3

Immaterial Restatement of Prior Period Financial Statements (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenue | $ 232,537 |  |  | $ 221,288 |  |  | $ 537,679 | $ 530,779 |  |  |
Operating expenses: |  |  |  |  |  |  |  |  |  |  |
Income taxes | 12,194 |  |  | 11,786 |  |  | 13,524 | 16,950 |  |  |
Total operating expenses |  |  |  | 173,959 |  |  |  | 446,775 |  |  |
Net operating income | 51,567 |  |  | 47,329 |  |  | 79,056 | 84,004 |  |  |
Net income | $ 42,424 | $ 16,996 | $ (7,640) | $ 36,173 | $ 14,805 | $ (762) | $ 51,780 | $ 50,216 |  |  |
Earnings per share: |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 0.88 |  |  | $ 0.75 |  |  | $ 1.08 | $ 1.04 |  |  |
Diluted (in dollars per share) | $ 0.88 |  |  | $ 0.75 |  |  | $ 1.08 | $ 1.04 |  |  |
Retained earnings | $ 415,326 |  |  | $ 385,699 | 358,538 | 352,747 | $ 415,326 | $ 385,699 | $ 392,053 | $ 362,512 |
Total common stockholders’ equity | 757,795 | 723,164 | 714,129 | 723,140 | 695,257 | 688,853 | 757,795 | 723,140 | $ 730,157 | 699,221 | $ 699,221
Operating activities: |  |  |  |  |  |  |  |  |  |  |
Net income | $ 42,424 | $ 16,996 | $ (7,640) | 36,173 | 14,805 | (762) | 51,780 | 50,216 |  |  |
Other changes in noncurrent assets and liabilities |  |  |  |  |  |  | 21,602 | 644 |  |  |
Net cash provided by operating activities |  |  |  |  |  |  | $ 128,343 | 119,503 |  |  |
Corrections |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  | 2,305 |  |  |  | 6,917 |  |  |
Operating expenses: |  |  |  |  |  |  |  |  |  |  |
Income taxes |  |  |  | 524 |  |  |  | 1,570 |  |  |
Total operating expenses |  |  |  | 524 |  |  |  | 1,570 |  |  |
Net operating income |  |  |  | 1,781 |  |  |  | 5,347 |  |  |
Net income |  |  |  | $ 1,781 |  |  |  | $ 5,347 |  |  |
Earnings per share: |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) |  |  |  | $ 0.03 |  |  |  | $ 0.11 |  |  |
Diluted (in dollars per share) |  |  |  | $ 0.03 |  |  |  | $ 0.11 |  |  |
Retained earnings |  |  |  | $ 11,106 | 9,325 | 7,542 |  | $ 11,106 |  | 5,759 |
Total common stockholders’ equity |  |  |  | 11,106 | 9,325 | 7,542 |  | 11,106 |  | 5,759 |
Operating activities: |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  | 1,781 |  |  |  | 5,347 |  |  |
Other changes in noncurrent assets and liabilities |  |  |  |  |  |  |  | (5,347) |  |  |
Net cash provided by operating activities |  |  |  |  |  |  |  | 0 |  |  |
As Previously Reported |  |  |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenue |  |  |  | 218,983 |  |  |  | 523,862 |  |  |
Operating expenses: |  |  |  |  |  |  |  |  |  |  |
Income taxes |  |  |  | 11,262 |  |  |  | 15,380 |  |  |
Total operating expenses |  |  |  | 173,435 |  |  |  | 445,205 |  |  |
Net operating income |  |  |  | 45,548 |  |  |  | 78,657 |  |  |
Net income |  |  |  | $ 34,392 |  |  |  | $ 44,869 |  |  |
Earnings per share: |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) |  |  |  | $ 0.72 |  |  |  | $ 0.93 |  |  |
Diluted (in dollars per share) |  |  |  | $ 0.72 |  |  |  | $ 0.93 |  |  |
Retained earnings |  |  |  | $ 374,593 | 349,213 | 345,205 |  | $ 374,593 |  | 356,753 |
Total common stockholders’ equity |  |  |  | 712,034 | $ 685,932 | $ 681,311 |  | 712,034 |  | $ 693,462 |
Operating activities: |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  | $ 34,392 |  |  |  | 44,869 |  |  |
Other changes in noncurrent assets and liabilities |  |  |  |  |  |  |  | 5,991 |  |  |
Net cash provided by operating activities |  |  |  |  |  |  |  | $ 119,503 |  |  |

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