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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash flows from operating activities:    
Net income $ 4,605 $ 3,413
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation and amortization of fixed and intangible assets 4,983 3,939
Amortization of other long term assets and debt issuance costs 1,163 1,423
Amortization of discounted liabilities 102 6
Stock-based compensation 1,309 1,080
Increase in deferred income taxes   8
Operating loss from equity method investment 217 42
Changes in assets and liabilities associated with operations:    
(Increase) decrease in net receivables (9,303) 11,422
Increase in inventories (19,558) (1,366)
Increase in prepaid expenses and other assets (562) (1,126)
(Increase) decrease in income tax receivable/payable, net (497) 793
Increase (decrease) in accounts payable 9,613 (3,025)
Decrease in deferred revenue (2,740) (394)
Increase in accrued program costs 4,634 6,612
Decrease in other payables and accrued expenses (3,201) (5,657)
Net cash (used in) provided by operating activities (9,235) 17,170
Cash flows from investing activities:    
Capital expenditures (1,553) (3,080)
Acquisitions of businesses and intangible assets (815) (300)
Net cash used in investing activities (2,368) (3,380)
Cash flows from financing activities:    
Payments under line of credit agreement (23,000) (27,000)
Borrowings under line of credit agreement 35,800 16,000
Net payments from the issuance of common stock (sale of stock under ESPP, exercise of stock options, and shares purchased for tax withholdings) 810 303
Payment of cash dividends (438) (289)
Net cash provided by (used in) financing activities 13,172 (10,986)
Net increase in cash and cash equivalents 1,569 2,804
Cash and cash equivalents at beginning of period 11,337 7,869
Effect of exchange rate changes on cash and cash equivalents 112 119
Cash and cash equivalents at end of period $ 13,018 $ 10,792