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Quarterly Financial Data (Unaudited) (Tables)
 12 Months Ended
Dec. 31, 2012
Quarterly Financial Data (Unaudited) [Abstract]  
Quarterly Financial Data

 
 
Quarter ended
 
 
March 31
 
 
June 30
 
 
Sept. 30
 
 
Dec. 31
 
 
(in thousands, except per share amounts)
 
2012:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Revenues                                              
 
$
595,177
 
 
$
519,256
 
 
$
511,953
 
 
$
532,438
 
Gross profit                                              
 
 
103,004
 
 
 
87,294
(1)
 
 
98,420
 
 
 
93,503
 
Operating income                                              
 
 
23,046
 
 
 
9,415
 
 
 
19,140
 
 
 
15,893
(2)
Net income                                              
 
 
13,884
 
 
 
5,621
 
 
 
11,452
 
 
 
9,445
 
Basic net income per share                                              
 
 
0.54
 
 
 
0.22
 
 
 
0.45
 
 
 
0.34
(3)
Diluted net income per share
 
 
0.54
 
 
 
0.22
 
 
 
0.45
 
 
 
0.34
(3)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2011:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Revenues                                              
 
$
536,381
 
 
$
472,903
 
 
$
471,821
 
 
$
495,114
 
Gross profit                                              
 
 
90,959
 
 
 
83,841
 
 
 
87,029
 
 
 
89,946
(4)
Operating income                                              
 
 
15,129
 
 
 
11,400
 
 
 
14,094
 
 
 
16,691
 
Net income                                              
 
 
8,786
 
 
 
6,741
 
 
 
4,099
(5)
 
 
10,844
 
Basic net income per share                                              
 
 
0.33
 
 
 
0.25
 
 
 
0.16
 
 
 
0.42
 
Diluted net income per share
 
 
0.33
 
 
 
0.25
 
 
 
0.16
 
 
 
0.42
 

(1)
Included in the results for the second quarter of 2012 is a $2.9 million reduction to payroll tax expense related to a refund of Pennsylvania sales taxes.  Please read Note 13, "Commitments and Contingencies," for additional information.
(2)
Included in the results for the fourth quarter of 2012 is a $4.2 million impairment charge, related to our Performance Management reporting unit.  Please read Note 5, "Goodwill and Other Intangible Assets," for additional information.
(3)
Under the two-class earnings per share method, undistributed losses resulting from dividends exceeding net income are not allocated to participating securities.  This resulted in a $0.03 earnings per share decrease in the fourth quarter of 2012.  Please read Note 11, "Net Income Per Share," for additional information.
(4)
Included in the results for the fourth quarter of 2011 is a $2.5 million adjustment related to the reversal of Pennsylvania sales taxes accrued in prior periods.  Please read Note 13, "Commitments and Contingencies," for additional information.
(5)
Included in the results for the third quarter of 2011 is a $4.4 million loss related to the exchange of an aircraft and a $3.1 million loss related to a settlement with the State of California.  Please read Note 13, "Commitments and Contingencies," for additional information on the settlement with the State of California.