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Consolidated Statements Of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash flows from operating activities:      
Net income $ 12,024 $ 11,623 $ 12,243
Adjustments to reconcile net income to net cash (used in) provided by operating activities, net of acquisitions:      
Depreciation and amortization 6,647 4,717 3,830
Non-cash restructuring 2,550    
Deferred income taxes (1,328) 838 2,221
Stock-based compensation 1,072 1,573 827
Amortization of debt issuance costs 357 97 154
Provision for doubtful accounts 7,373 4,309 2,818
Revaluation of contingent consideration   130  
Changes in operating assets and liabilities, net of acquisitions:      
Accounts receivable (32,606) (19,512) (9,276)
Prepaid expenses and other current assets (282) 2,318 (873)
Accounts payable (1,530) 570 (850)
Accrued expenses 4,980 (2,557) (4,066)
Net cash (used in) provided by operating activities (743) 4,106 7,028
Cash flows from investing activities:      
Acquisitions of businesses (20,026) (8,365) (7,172)
Acquisition of customer list   (146) (50)
Purchases of property and equipment (1,712) (2,213) (5,274)
Net cash used in investing activities (21,738) (10,724) (12,496)
Cash flows from financing activities:      
Payments on term loan (938)    
Payments on revolver (27,000)    
Excess tax benefit from exercise of stock options 1,090 269 816
Payment on contingent earn-out obligation (100) (1,000)  
Payments for debt issuance costs (503) (1,165) (290)
Cash received from exercise of stock options 3,016 305 214
Borrowings on revolver 27,000    
Borrowings on term loan 25,000    
Borrowings on capital lease obligations     2,896
Payments on capital lease obligations (1,175) (1,050) (370)
Net cash provided by (used in) financing activities 26,390 (2,641) 3,266
Net change in cash 3,909 (9,259) (2,202)
Cash, at beginning of period 4,104 13,363 15,565
Cash, at end of period 8,013 4,104 13,363
Supplemental disclosures of cash flow information:      
Cash paid for interest 2,322 786 698
Cash paid for income taxes 5,087 911 4,465
Supplemental disclosures of non-cash investing and financing activities      
Contingent and deferred consideration accrued for acquisitions     1,020
Property and equipment acquired through capital lease obligations 618 378 1,137
Tax benefit related to the amortization of tax goodwill in excess of book basis $ 203 $ 123 $ 123