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Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charges and other | $ (600) |  |  | $ 1,300 |  | $ 9,800 |  |  |  |  |  |  |  | $ 10,480 | $ 3,687 | $ 3,342
Selected Quarterly Financial Information [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues | 650,011 |  | $ 626,286 | 627,838 |  | 699,479 |  | $ 595,865 |  | $ 560,303 | $ 564,621 |  | $ 636,999 | 2,603,614 | 2,357,788 | 2,256,112
Gross profit | 97,045 |  | 106,743 | 104,219 |  | 129,860 |  | 101,359 |  | 100,817 | 95,453 |  | 106,176 | 437,867 | 403,805 | 393,251
Operating income | 10,026 | [1] | 19,936 | 12,217 | [2] | 23,520 | [3] | 13,009 | [4] | 14,460 | 3,414 | [5] | 16,591 | 65,699 | 47,474 | 56,223
Net income | $ 6,339 |  | $ 11,950 | $ 7,314 |  | $ 13,787 |  | $ 8,164 |  | $ 8,385 | $ 1,891 |  | $ 9,564 | $ 39,390 | $ 28,004 | $ 32,032
Basic net income per share of common stock (in dollars per share) | $ 0.26 |  | $ 0.48 | $ 0.29 |  | $ 0.54 |  | $ 0.27 | [6] | $ 0.33 | $ 0.07 |  | $ 0.37 | $ 1.58 | $ 1.05 | $ 1.25
Diluted net income per share (in dollars per share) | $ 0.26 |  | $ 0.48 | $ 0.29 |  | $ 0.54 |  | $ 0.27 | [6] | $ 0.33 | $ 0.07 |  | $ 0.37 | $ 1.58 | $ 1.05 | $ 1.25
Goodwill and Intangible Asset Impairment |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,500 |  |  | $ 3,300
Asset impairment charge due to change in office consolidation plans |  |  |  |  |  |  |  | $ 1,200 |  |  |  |  |  |  |  |
[1] | 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.
[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 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.
[4] | Includes a $1.2 million non-cash charge in the fourth quarter of 2014. Please read Note 1, “Accounting Policies,” for additional information.
[5] | 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.
[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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