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Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Data |
| Quarter Ended
(in thousands, except per share amounts) | March 31 |  | June 30 |  | Sept. 30 |  | Dec. 31
2018 |  |  |  |  |  |  |
Revenues | $ | 1,014,372 |  |  | $ | 922,295 |  |  | $ | 925,126 |  |  | $ | 966,756 |
Gross profit | 199,720 |  |  | 154,544 |  |  | 166,054 |  |  | 161,591 |
Operating income | 64,703 |  |  | 33,581 |  |  | 48,133 |  |  | 32,619 |
Net income | 49,991 |  |  | 24,560 |  |  | 36,207 |  |  | 24,655 |
Basic net income per share | 1.20 |  |  | 0.59 |  |  | 0.86 |  |  | 0.59 |
Diluted net income per share | 1.18 |  |  | 0.58 |  |  | 0.86 |  |  | 0.59 |
2017 |  |  |  |  |  |  |
Revenues | $ | 882,664 |  |  | $ | 795,552 |  |  | $ | 795,513 |  |  | $ | 826,494 |
Gross profit | 159,346 |  |  | 130,553 |  |  | 139,966 |  |  | 142,866 |
Operating income | 53,492 |  |  | 22,938 |  |  | 29,799 |  |  | 23,712 |
Net income | 35,628 |  |  | 14,018 |  |  | 19,202 |  |  | 15,554 |
Basic net income per share(1) | 0.85 |  |  | 0.34 |  |  | 0.46 |  |  | 0.36 |
Diluted net income per share(1) | 0.85 |  |  | 0.33 |  |  | 0.46 |  |  | 0.36 |
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(1) | Adjusted to reflect the two-for-one split of our common stock effected on December 18, 2017 as a stock dividend.

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