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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Cash flows from operating activities:    
Net income $ 16,659 $ 11,962
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization of fixed and intangible assets 14,233 12,358
Amortization of other long term assets 3,630 3,995
Amortization of discounted liabilities 314 20
Stock-based compensation 4,235 3,585
(Decrease) increase in deferred income taxes (34) 6
Loss from equity method investments 1,051 226
Changes in assets and liabilities associated with operations:    
Increase in net receivables (24,382) (15,746)
Increase in inventories (39,305) (2,213)
Increase in prepaid expenses and other assets (959) (3,678)
Increase (decrease) in income tax receivable/payable, net 2,069 (12,137)
Increase in accounts payable 5,711 4,556
Decrease in deferred revenue (13,965) (3,848)
Increase in accrued program costs 22,882 22,720
Decrease in other payables and accrued expenses (7,229) (3,562)
Net cash (used) provided by operating activities (15,090) 18,244
Cash flows from investing activities:    
Capital expenditures (5,154) (5,333)
Investments   (950)
Acquisition of product lines and other intangible assets (1,634) (25,904)
Net cash used in investing activities (6,788) (32,187)
Cash flows from financing activities:    
Payments under line of credit agreement (71,125) (59,025)
Borrowings under line of credit agreement 90,800 76,000
Payments on other long-term liabilities   (26)
Net payments from the issuance of common stock (sale of stock under ESPP, exercise of stock options, and shares purchased for tax withholding) 1,731 (820)
Payment of cash dividends (1,611) (1,161)
Net cash provided by financing activities 19,795 14,968
Net (decrease) increase in cash and cash equivalents (2,083) 1,025
Effect of exchange rate changes on cash and cash equivalents 114 151
Cash and cash equivalents at beginning of period 11,337 7,869
Cash and cash equivalents at end of period $ 9,368 $ 9,045