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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Cash flows from operating activities:    
Net income $ 10,165 $ 16,659
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation and amortization of property, plant and equipment and intangible assets 13,892 14,233
Amortization of other long term assets 3,174 3,630
Amortization of discounted liabilities 41 314
Provision for bad debts 728 540
Reassessment of deferred consideration (3,539) (5,437)
Stock-based compensation 5,159 4,235
Deferred income taxes (459) (34)
Loss from equity method investments 149 1,051
Changes in assets and liabilities associated with operations:    
Increase in net receivables (15,983) (24,922)
Increase in inventories (19,713) (39,305)
Increase in prepaid expenses and other assets (849) (959)
Increase in net operating lease liability 117  
(Decrease) increase in income tax receivable/payable, net (4,477) 2,069
(Decrease) increase in accounts payable (5,516) 5,711
Decrease in deferred revenue (19,800) (13,965)
Increase in accrued program costs 20,163 22,882
Decrease in other payables and accrued expenses (4,936) (1,792)
Net cash used in operating activities (21,684) (15,090)
Cash flows from investing activities:    
Capital expenditures (10,546) (5,154)
Acquisition of business, product lines, and intangible assets (31,836) (1,634)
Net cash used in investing activities (42,382) (6,788)
Cash flows from financing activities:    
Net borrowings under line of credit agreement 68,200 19,675
Net payments from the issuance of common stock (sale of stock under ESPP, exercise of stock options, and shares purchased for tax withholding) (30) 1,731
Repurchase of common stock (2,604)  
Payment of cash dividends (1,741) (1,611)
Net cash provided by financing activities 63,825 19,795
Net decrease in cash and cash equivalents (241) (2,083)
Effect of exchange rate changes on cash and cash equivalents (40) 114
Cash and cash equivalents at beginning of period 6,168 11,337
Cash and cash equivalents at end of period $ 5,887 $ 9,368