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Consolidated Statements Of Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Consolidated Statements Of Income [Abstract]      
Net service revenues $ 400,688 $ 336,815 $ 312,942
Cost of service revenues 294,593 245,492 229,207
Gross profit 106,095 91,323 83,735
General and administrative expenses 84,213 70,452 61,834
Revaluation of contingent consideration   130  
Depreciation and amortization 6,647 4,717 3,830
Total operating expenses 90,860 75,299 65,664
Operating income from continuing operations 15,235 16,024 18,071
Interest income (2,812) (47) (18)
Interest expense 2,332 786 698
Total interest (income) expense, net (480) 739 680
Other income 206    
Income from continuing operations before income taxes 15,921 15,285 17,391
Income tax expense 3,994 3,932 5,428
Net income from continuing operations 11,927 11,353 11,963
Earnings from discontinued operations 97 270 280
Net income $ 12,024 $ 11,623 $ 12,243
Net income per common share      
Basic income per share $ 1.06 $ 1.06 $ 1.12
Diluted income per share 1.06 1.04 1.10
Basic income per share      
Continuing operations 1.05 1.03 1.10
Discontinued operations 0.01 0.03 0.02
Diluted income per share      
Continuing operations 1.05 1.02 1.08
Discontinued operations $ 0.01 $ 0.02 $ 0.02
Weighted average number of common shares and potential common shares outstanding:      
Basic 11,292,000 10,986,000 10,900,000
Diluted 11,349,000 11,189,000 11,114,000