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Acquisitions (Unaudited Pro Forma Condensed Consolidated Income Statement Information) (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Acquisitions [Abstract]      
Net service revenues $ 405,524 $ 392,887 $ 334,517
Operating income 14,437 20,383 19,458
Net income from continuing operations, net of tax 11,409 14,135 12,893
Earnings from discontinued operations 97 270 280
Net income $ 11,506 $ 14,405 $ 13,173
Basic income per share, Continuing Operations $ 1.01 $ 1.29 $ 1.18
Basic income per share, Discontinued Operations 0.01 0.02 0.03
Basic income per share 1.02 1.31 1.21
Diluted income per share, Continuing Operations 1.00 1.27 1.16
Diluted income per share, Discontinued Operations 0.01 0.02 0.03
Diluted income per share $ 1.01 $ 1.29 $ 1.19