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Quarterly Financial Data (unaudited) (Tables)
 12 Months Ended
Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]  
Schedule Of Quarterly Financial Data
 
Quarter Ended
 
March 31
 
June 30
 
September 30
 
December 31
2017
 
 
 
 
 
 
 
Revenues
$
446,344

 
$
444,715

 
$
448,962

 
$
467,711

Operating expenses
 
 
 
 
 
 
 
Direct cost of revenues
309,072

 
304,071

 
294,851

 
307,566

Selling, general and administrative expenses
107,295

 
107,342

 
103,909

 
111,176

Special charges
—

 
30,074

 
—

 
10,811

Acquisition-related contingent consideration
395

 
777

 
252

 
867

Amortization of other intangible assets
2,493

 
2,422

 
2,882

 
2,766

 
419,255

 
444,686

 
401,894

 
433,186

Operating income
27,089

 
29

 
47,068

 
34,525

Interest income and other
605

 
1,592

 
1,103

 
452

Interest expense
(5,801
)
 
(6,250
)
 
(6,760
)
 
(6,547
)
Income before income tax provision (benefit)
21,893

 
(4,629
)
 
41,411

 
28,430

Income tax provision (benefit)
7,877

 
527

 
9,197

 
(38,458
)
Net income
$
14,016

 
$
(5,156
)
 
$
32,214

 
$
66,888

Earnings per common share — basic (1)
$
0.35

 
$
(0.13
)
 
$
0.86

 
$
1.81

Earnings per common share — diluted (1)
$
0.34

 
$
(0.13
)
 
$
0.85

 
$
1.78

Weighted average common shares outstanding
 
 
 
 
 
 
 
Basic
40,527

 
39,555

 
37,431

 
36,906

Diluted
41,245

 
39,555

 
37,746

 
37,643

 
Quarter Ended
 
March 31
 
June 30
 
September 30
 
December 31
2016
 
 
 
 
 
 
 
Revenues
$
470,285

 
$
460,147

 
$
438,042

 
$
441,920

Operating expenses
 
 
 
 
 
 
 
Direct cost of revenues
305,636

 
303,194

 
293,702

 
308,239

Selling, general and administrative expenses
103,609

 
108,245

 
106,220

 
116,478

Special charges
5,061

 
1,750

 
—

 
3,634

Acquisition-related contingent consideration
1,134

 
206

 
201

 
623

Amortization of other intangible assets
2,606

 
2,590

 
2,845

 
2,265

 
418,046

 
415,985

 
402,968

 
431,239

Operating income
52,239

 
44,162

 
35,074

 
10,681

Interest income and other
2,557

 
4,125

 
3,213

 
571

Interest expense
(6,229
)
 
(6,303
)
 
(6,304
)
 
(5,983
)
Income before income tax provision
48,567

 
41,984

 
31,983

 
5,269

Income tax provision
18,386

 
15,437

 
10,292

 
(1,832
)
Net income
$
30,181

 
$
26,547

 
$
21,691

 
$
7,101

Earnings per common share — basic (1)
$
0.75

 
$
0.65

 
$
0.53

 
$
0.17

Earnings per common share — diluted (1)
$
0.73

 
$
0.64

 
$
0.52

 
$
0.17

Weighted average common shares outstanding
 
 
 
 
 
 
 
Basic
40,506

 
40,820

 
41,239

 
41,201

Diluted
41,148

 
41,599

 
42,065

 
42,018


 
(1) 
The sum of the quarterly earnings per share amounts may not equal the annual amounts due to changes in the weighted average number of common shares outstanding during each quarterly period.