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Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Data |
|  | Quarter ended |
|  | March 31 |  | June 30 |  |  |  | Sept. 30 |  |  |  | Dec. 31 |
|  | (in thousands, except per share amounts) |
2016 |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ | 802,408 |  |  | $ | 707,332 |  |  |  |  | $ | 702,538 |  |  |  |  | $ | 729,069 |  |
Gross profit |  | 150,016 |  |  | 113,259 |  |  |  |  | 117,796 |  |  |  |  | 110,539 |  |
Operating income |  | 53,043 |  |  | 16,023 |  |  |  | 22,773 |  |  |  |  | 14,467 |  |
Net income |  | 32,693 |  |  | 9,713 |  |  |  |  | 14,065 |  |  |  |  | 9,520 |  |
Basic net income per share |  | 1.53 |  |  | 0.45 |  |  |  |  | 0.66 |  |  |  |  | 0.45 |  |
Diluted net income per share |  | 1.53 |  |  | 0.45 |  |  |  |  | 0.66 |  |  |  |  | 0.45 |  |
2015 |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ | 699,479 |  |  | $ | 627,838 |  |  |  |  | $ | 626,286 |  |  |  |  | $ | 650,011 |  |
Gross profit |  | 129,860 |  |  | 104,219 |  |  |  |  | 106,743 |  |  |  |  | 97,045 |  |
Operating income |  | 23,520 |  | (1) | 12,217 |  | (2) |  | 19,936 |  |  |  |  | 10,026 |  | (3)
Net income |  | 13,787 |  |  | 7,314 |  |  |  | 11,950 |  |  |  |  | 6,339 |  |
Basic net income per share |  | 0.54 |  |  | 0.29 |  |  |  |  | 0.48 |  |  |  |  | 0.26 |  |
Diluted net income per share |  | 0.54 |  |  | 0.29 |  |  |  |  | 0.48 |  |  |  |  | 0.26 |  |
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(1) | Includes non-cash impairment and other charges in the first quarter of 2015 of $9.8 million. Please read Note 7, “Impairment Charges and Other,” for additional information.
(2) | Includes non-cash impairment and other charges in the second quarter of 2015 of $1.3 million. Please read Note 7, “Impairment Charges and Other,” for additional information.
(3) | Includes a reduction to non-cash impairment and other charges in the fourth quarter of 2015 of $0.6 million. Please read Note 7, “Impairment Charges and Other,” for additional information.

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