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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Cash flows from operating activities:    
Net income $ 11,962 $ 9,170
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization of fixed and intangible assets 12,358 12,367
Amortization of other long term assets 3,995 3,935
Amortization of discounted liabilities 20 28
Stock-based compensation 3,585 1,656
Excess tax benefit from exercise of stock options   (82)
Increase in deferred income taxes 6  
Loss from equity method investments 226 309
Changes in assets and liabilities associated with operations:    
Increase in net receivables (15,746) (19,202)
Increase in inventories (2,213) (5,201)
Increase in prepaid expenses and other assets (3,678) (1,011)
(Decrease) increase in income tax receivable/payable, net (12,137) 1,519
Increase in accounts payable 4,556 7,925
Decrease in deferred revenue (3,848) (8,847)
Increase in accrued program costs 22,720 30,536
(Decrease) increase in other payables and accrued expenses (3,562) 3,098
Net cash provided by operating activities 18,244 36,200
Cash flows from investing activities:    
Capital expenditures (5,333) (6,122)
Investment (950) (3,283)
Acquisition of product lines and other intangible assets (25,904) (224)
Net cash used in investing activities (32,187) (9,629)
Cash flows from financing activities:    
Payments under line of credit agreement (59,025) (24,000)
Borrowings under line of credit agreement 76,000  
Payments on other long-term liabilities (26) (541)
Tax benefit from exercise of stock options   82
Net payments from the issuance of common stock (sale of stock under ESPP, exercise of stock options, and shares purchased for tax withholding) (820) 204
Payment of cash dividends (1,161) (289)
Net cash provided by (used in) financing activities 14,968 (24,544)
Net increase in cash and cash equivalents 1,025 2,027
Effect of exchange rate changes on cash and cash equivalents 151 (957)
Cash and cash equivalents at beginning of period 7,869 5,524
Cash and cash equivalents at end of period $ 9,045 $ 6,594