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Unaudited Quarterly Financial Results (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Unaudited Quarterly Financial Information
 
 
Quarter Ended
 
Year Ended Dec. 31,
2017
 
Mar. 31,
 
June 30,
 
Sept. 30,
 
Dec. 31,(1)
 
 
 
 
 
 
Revenues
 
$
626,528

 
$
653,313

 
$
667,048

 
$
679,035

 
$
2,625,924

Gross profit
 
198,144

 
212,937

 
218,315

 
220,677

 
850,073

Income from continuing operations
 
22,382

 
33,236

 
34,879

 
67,377

 
157,874

Income (loss) from discontinued operations, net of income taxes
 
9

 
(139
)
 
(23
)
 
(46
)
 
(199
)
Net income
 
$
22,391

 
$
33,097

 
$
34,856

 
$
67,331

 
$
157,675

 
 
 
 
 
 
 
 
 
 
 
Per share income from continuing operations and net income:

 
 

 
 

 
 
 
 

 
 
Basic
 
$
0.43

 
$
0.63

 
$
0.66

 
$
1.29

 
$
3.01

Diluted
 
$
0.42

 
$
0.62

 
$
0.66

 
$
1.28

 
$
2.97


 
 
Quarter Ended
 
Year Ended Dec. 31,
2016
 
Mar. 31,
 
June 30,
 
Sept. 30,
 
Dec. 31,(2)
 
 
 
 
 
 
Revenues
 
$
582,040

 
$
608,088

 
$
629,401

 
$
620,884

 
$
2,440,413

Gross profit
 
187,782

 
202,086

 
207,120

 
198,195

 
795,183

Income from continuing operations
 
17,348

 
26,013

 
29,775

 
24,060

 
97,196

Income (loss) from discontinued operations, net of income taxes
 
53

 
(9
)
 
(7
)
 
(32
)
 
5

Net income
 
$
17,401

 
$
26,004

 
$
29,768

 
$
24,028

 
$
97,201

 
 
 

 
 

 
 

 
 

 
 
Per share income from continuing operations and net income:

 
 
 
 
 
 
 
 
 
 
Basic
 
$
0.33

 
$
0.49

 
$
0.56

 
$
0.45

 
$
1.83

Diluted
 
$
0.32

 
$
0.48

 
$
0.55

 
$
0.45

 
$
1.81

 ______
(1)
On December 22, 2017, the U.S. government enacted comprehensive tax legislation, the TCJA. In the fourth quarter of 2017, the Company recorded an estimated net tax benefit of $31.4 million for the impact of the TCJA, which is included in the provision for income taxes in the consolidated statement of operations and comprehensive income, see “Note 9. Income Taxes”.

(2)
The fourth quarter of 2016 included out-of-period adjustments of $5.6 million for costs of services that were understated in prior quarters. As a result, costs of services for the fourth quarter of 2016 were overstated by $5.6 million and gross profit, net income and diluted earnings per common share were understated by $5.6 million, $3.4 million and $0.06, respectively.