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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
OPERATING ACTIVITIES    
Net income $ 16,842 $ 16,599
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 1,027 849
(Accretion) of discount/amortization of premium related to marketable securities, net (5) 152
Stock-based compensation expense 1,082 1,044
Deferred income tax (benefit)/provision (375) 253
(Increase) decrease in assets:    
Accounts receivable (10,880) (5,471)
Inventories (4,134) 497
Prepaid expenses and other current assets 406 (6,925)
Income taxes receivable 330 603
Other non-current assets (860) (996)
Increase (decrease) in liabilities:    
Accounts payable 4,592 9,244
Accrued expenses and other liabilities 2,659 537
Other long-term liabilities 1,679 1,730
Net cash provided by operating activities 12,363 18,116
INVESTING ACTIVITIES    
Capital expenditures (1,719) (721)
Purchases of marketable securities (299) (12,350)
Sales of marketable securities 7,530 5,714
Maturities of marketable securities 448 1,188
Net cash provided by (used for) investing activities 5,960 (6,169)
FINANCING ACTIVITIES    
Payment of dividends (8,209) (6,920)
Cash paid for common stock purchased and retired (5,892) (3,206)
Net cash used for financing activities (14,101) (10,126)
Net increase in cash and cash equivalents 4,222 1,821
Cash and cash equivalents at beginning of year 8,745 7,684
Cash and cash equivalents at end of year 12,967 9,505
Supplemental information:    
Income tax payments, net $ 3,526 $ 2,709