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Unaudited Summarized Quarterly Financial Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Unaudited Summarized Quarterly Financial Information [Abstract]                      
Net service revenues $ 103,657 $ 103,502 $ 100,927 $ 92,602 $ 84,760 $ 84,331 $ 85,809 $ 81,915 $ 400,688 $ 336,815 $ 312,942
Gross profit 28,658 27,423 25,695 24,319 22,193 23,522 23,682 21,926 106,095 91,323 83,735
Operating income from continuing operations 7,693 2,495 4,394 653 3,015 4,284 5,098 3,627 15,235 16,024 18,071
Net income from continuing operations 7,471 1,699 2,600 157 3,051 2,887 3,253 2,162 11,927 11,353 11,963
Earnings from discontinued operations 97       270            
Net income $ 7,568 $ 1,699 $ 2,600 $ 157 $ 3,321 $ 2,887 $ 3,253 $ 2,162 $ 12,024 $ 11,623 $ 12,243
Average shares outstanding: Basic 11,383,000 11,367,000 11,361,000 11,022,000 11,007,000 11,007,000 10,989,000 10,947,000 11,292,000 10,986,000 10,900,000
Average shares outstanding: Diluted 11,494,000 11,417,000 11,385,000 11,178,000 11,220,000 11,247,000 11,212,000 11,612,000 11,349,000 11,189,000 11,114,000
Continuing operations - Basic $ 0.66 $ 0.15 $ 0.23 $ 0.01 $ 0.28 $ 0.26 $ 0.30 $ 0.20 $ 1.05 $ 1.03 $ 1.10
Discontinued operations - Basic 0.01       0.02       0.01 0.03 0.02
Basic income per share 0.67 0.15 0.23 0.01 0.30 0.26 0.30 0.20 1.06 1.06 1.12
Continuing operations - Diluted 0.65 0.15 0.23 0.01 0.27 0.26 0.29 0.19 1.05 1.02 1.08
Discontinued operations - Diluted 0.01       0.02       0.01 0.02 0.02
Diluted income per share $ 0.66 $ 0.15 $ 0.23 $ 0.01 $ 0.29 $ 0.26 $ 0.29 $ 0.19 $ 1.06 $ 1.04 $ 1.10