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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Cash flows from operating activities:    
Net income $ 7,012 $ 10,169
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization of property, plant and equipment and intangible assets 9,233 9,516
Amortization of other long term assets 2,146 2,313
Amortization of discounted liabilities   202
Provision for bad debts 445 181
Revision of deferred compensation (2,888) (1,468)
Stock-based compensation 2,995 2,778
Change in deferred income taxes (572) (26)
Loss from equity method investments 60 518
Changes in assets and liabilities associated with operations:    
Decrease in net receivables 7,841 5,297
Increase in inventories (27,635) (40,194)
Increase in prepaid expenses and other assets (1,844) (707)
Increase in net operating lease liability 73  
Increase in income tax receivable/payable, net (4,480) (271)
(Decrease) increase in accounts payable (10,138) 11,309
Decrease in deferred revenue (19,438) (7,254)
Increase in accrued program costs 11,823 15,039
Decrease in other payables and accrued expenses (6,719) (3,683)
Net cash (used in) provided by operating activities (32,086) 3,719
Cash flows from investing activities:    
Capital expenditures (7,216) (3,230)
Acquisition of business, product lines, and intangible assets (24,302) (1,631)
Net cash used in investing activities (31,518) (4,861)
Cash flows from financing activities:    
Payments under line of credit agreement (54,200) (62,125)
Borrowings under line of credit agreement 122,000 58,800
Net (payments) receipts from the issuance of common stock (sale of stock under ESPP, exercise of stock options, and shares purchased for tax withholding) (513) 1,335
Repurchase of common stock (2,604)  
Payment of cash dividends (1,160) (1,024)
Net cash provided by (used in) financing activities 63,523 (3,014)
Net decrease in cash and cash equivalents (81) (4,156)
Effect of exchange rate changes on cash and cash equivalents 220 (82)
Cash and cash equivalents at beginning of period 6,168 11,337
Cash and cash equivalents at end of period $ 6,307 $ 7,099