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v3.19.2

Immaterial Restatement of Prior Period Financial Statements (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |
Operating revenue | $ 179,031 |  | $ 174,938 |  | $ 305,142 | $ 309,491 |  |  |
Operating expenses: |  |  |  |  |  |  |  |  |
Income taxes | 4,321 |  | 4,870 |  | 1,330 | 5,164 |  |  |
Total operating expenses |  |  | 148,099 |  |  | 272,816 |  |  |
Net operating income | 27,013 |  | 26,839 |  | 27,489 | 36,675 |  |  |
Net income | $ 16,996 | $ (7,640) | $ 14,805 | $ (762) | $ 9,356 | $ 14,043 |  |  |
Earnings per share: |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 0.35 |  | $ 0.31 |  | $ 0.19 | $ 0.29 |  |  |
Diluted (in dollars per share) | $ 0.35 |  | $ 0.31 |  | $ 0.19 | $ 0.29 |  |  |
Retained earnings | $ 382,409 |  | $ 358,538 | 352,747 | $ 382,409 | $ 358,538 | $ 392,053 | $ 362,512 |
Total common stockholders’ equity | 723,164 | 714,129 | 695,257 | 688,853 | 723,164 | 695,257 | $ 730,157 | 699,221 | $ 699,221
Operating activities: |  |  |  |  |  |  |  |  |
Net income (loss) | $ 16,996 | $ (7,640) | 14,805 | (762) | 9,356 | 14,043 |  |  |
Other changes in noncurrent assets and liabilities |  |  |  |  | 11,494 | 10,139 |  |  |
Net cash provided by operating activities |  |  |  |  | $ 43,391 | 49,571 |  |  |
Corrections |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |
Operating revenue |  |  | 2,306 |  |  | 4,612 |  |  |
Operating expenses: |  |  |  |  |  |  |  |  |
Income taxes |  |  | 523 |  |  | 1,046 |  |  |
Total operating expenses |  |  | 523 |  |  | 1,046 |  |  |
Net operating income |  |  | 1,783 |  |  | 3,566 |  |  |
Net income |  |  | $ 1,783 |  |  | $ 3,566 |  |  |
Earnings per share: |  |  |  |  |  |  |  |  |
Basic (in dollars per share) |  |  | $ 0.04 |  |  | $ 0.07 |  |  |
Diluted (in dollars per share) |  |  | $ 0.04 |  |  | $ 0.07 |  |  |
Retained earnings |  |  | $ 9,325 | 7,542 |  | $ 9,325 |  | 5,759 |
Total common stockholders’ equity |  |  | 9,325 | 7,542 |  | 9,325 |  | 5,759 |
Operating activities: |  |  |  |  |  |  |  |  |
Net income (loss) |  |  | 1,783 |  |  | 3,566 |  |  |
Other changes in noncurrent assets and liabilities |  |  |  |  |  | (3,566) |  |  |
Net cash provided by operating activities |  |  |  |  |  | 0 |  |  |
As Previously Reported |  |  |  |  |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |  |
Operating revenue |  |  | 172,632 |  |  | 304,879 |  |  |
Operating expenses: |  |  |  |  |  |  |  |  |
Income taxes |  |  | 4,347 |  |  | 4,118 |  |  |
Total operating expenses |  |  | 147,576 |  |  | 271,770 |  |  |
Net operating income |  |  | 25,056 |  |  | 33,109 |  |  |
Net income |  |  | $ 13,022 |  |  | $ 10,477 |  |  |
Earnings per share: |  |  |  |  |  |  |  |  |
Basic (in dollars per share) |  |  | $ 0.27 |  |  | $ 0.22 |  |  |
Diluted (in dollars per share) |  |  | $ 0.27 |  |  | $ 0.22 |  |  |
Retained earnings |  |  | $ 349,213 | 345,205 |  | $ 349,213 |  | 356,753 |
Total common stockholders’ equity |  |  | 685,932 | $ 681,311 |  | 685,932 |  | $ 693,462 |
Operating activities: |  |  |  |  |  |  |  |  |
Net income (loss) |  |  | $ 13,022 |  |  | 10,477 |  |  |
Other changes in noncurrent assets and liabilities |  |  |  |  |  | 13,705 |  |  |
Net cash provided by operating activities |  |  |  |  |  | $ 49,571 |  |  |

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