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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
OPERATING ACTIVITIES    
Net income $ 24,697 $ 23,760
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 1,556 1,330
(Accretion) of discount/amortization of premium related to marketable securities, net (5) 200
Stock-based compensation expense 1,626 1,572
Deferred income tax (benefit)/provision (1,074) 239
(Increase) decrease in assets:    
Accounts receivable (11,292) (4,353)
Inventories 1,757 (11,865)
Prepaid expenses and other current assets 254 569
Income taxes receivable 452 643
Other non-current assets (918) (1,227)
Increase (decrease) in liabilities:    
Accounts payable 4,951 6,863
Income taxes payable 446  
Accrued expenses and other liabilities 3,502 (609)
Other long-term liabilities 2,122 1,063
Net cash provided by operating activities 28,074 18,185
INVESTING ACTIVITIES    
Capital expenditures (2,013) (1,912)
Purchases of marketable securities (299) (15,075)
Sales of marketable securities 7,530 9,799
Maturities of marketable securities 448 1,973
Net cash provided by (used for) investing activities 5,666 (5,215)
FINANCING ACTIVITIES    
Payment of dividends (12,292) (10,372)
Cash paid for common stock purchased and retired (7,163) (4,136)
Net cash used for financing activities (19,455) (14,508)
Net increase (decrease) in cash and cash equivalents 14,285 (1,538)
Cash and cash equivalents at beginning of year 8,745 7,684
Cash and cash equivalents at end of year 23,030 6,146
Supplemental information:    
Income tax payments, net $ 5,710 $ 4,597