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Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Financial Data |
|  | Quarter ended |
|  | March 31 |  | June 30 |  |  |  | Sept. 30 |  |  |  | Dec. 31 |
|  | (in thousands, except per share amounts) |
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 |  |
2014 |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  | $ | 636,999 |  |  | $ | 564,621 |  |  |  |  | $ | 560,303 |  |  |  |  | $ | 595,865 |  |
Gross profit |  | 106,176 |  |  | 95,453 |  |  |  |  | 100,817 |  |  |  |  | 101,359 |  |
Operating income |  | 16,591 |  |  | 3,414 |  | (4) |  | 14,460 |  |  |  |  | 13,009 |  | (5)
Net income |  | 9,564 |  |  | 1,891 |  |  |  | 8,385 |  |  |  |  | 8,164 |  |
Basic net income per share |  | 0.37 |  |  | 0.07 |  |  |  |  | 0.33 |  |  |  |  | 0.27 |  | (6)
Diluted net income per share |  | 0.37 |  |  | 0.07 |  |  |  |  | 0.33 |  |  |  |  | 0.27 |  | (6)
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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 6, “Other Asset Impairments,” for additional information.
(2) | Includes non-cash impairment and other charges in the second quarter of 2015 of $1.3 million. Please read Note 6, “Other Asset Impairments,” 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 6, “Other Asset Impairments,” for additional information.
(4) | Includes a non-cash impairment charge in the first quarter of 2014 of $2.5 million. Please read Note 5, “Goodwill and Other Intangible Assets,” for additional information.
(5) | Includes a $1.2 million non-cash charge in the fourth quarter of 2014. Please read Note 1, “Accounting Policies,” for additional information.
(6) | Includes the impact of dividends exceeding earnings under the two-class method, resulting in a $0.05 earnings per share decrease in the fourth quarter of 2014. Please read Note 11, “Net Income Per Share,” for additional information.

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