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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

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