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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash flows from operating activities:    
Net income $ 65,662 $ 10,316
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation and amortization 4,941 4,456
Provision for doubtful accounts 1,247 682
Noncash stock compensation 1,447 1,190
Share of income of equity investment (98)
Impairment loss 2,393
Non-cash lease expense 5,060 3,011
Deferred tax provision (benefit) 1,653 (681)
Change in fair value of derivatives 1,154 (663)
Changes in:    
Accounts receivable (57,115) 54,791
Inventories (8,498) (27,076)
Other assets (25,860) 37
Operating lease liabilities (4,567) (2,974)
Accounts payable and accrued expenses 34,588 (63,415)
Income taxes, net 16,105 (961)
Net cash provided by (used in) operating activities 38,112 (21,287)
Cash flows from investing activities:    
Purchases of short-term investments (30,649) (6,878)
Proceeds from sale of short-term investments 4,821
Purchase of equity investment (13,998)
Purchases of buildings,equipment and leasehold improvements (120,253) (1,571)
Payment for intangible assets acquired (648) (819)
Net cash used in investing activities (146,729) (23,266)
Cash flows from financing activities:    
Proceeds from issuance of long-term debt 160,389 13,438
Repayment of long-term debt (17,888) (12,086)
Proceeds from exercise of options 1,583 657
Dividends paid (15,826) (20,805)
Dividends paid to noncontrolling interest (9,484) (324)
Net cash provided by (used in) financing activities 118,774 (19,120)
Effect of exchange rate changes on cash (4,490) (1,281)
Net decrease in cash and cash equivalents 5,667 (64,954)
Cash and cash equivalents - beginning of period 169,681 133,417
Cash and cash equivalents - end of period 175,348 68,463
Cash paid for:    
Interest 963 693
Income taxes $ 12,568 $ 4,741