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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Cash flows from operating activities:    
Net income $ 40,577 $ 36,121
Adjustments to reconcile net income to net cash provided by (used in) operating activities:    
Depreciation and amortization 4,114 5,510
Provision for doubtful accounts 332 215
Lease expense 881 0
Share based compensation 1,905 1,082
Deferred tax (benefit) (553) (1,504)
Change in fair value of derivatives (701) (134)
Changes in:    
Accounts receivable (10,919) (23,928)
Inventories (19,689) (36,044)
Other assets (974) (1,082)
Accounts payable and accrued expenses (16,637) 6,310
Income taxes, net 2,272 7,401
Net cash provided by (used in) operating activities 608 (6,053)
Cash flows from investing activities:    
Purchases of short-term investments (27,743) (10,000)
Proceeds from sale of short-term investments 28,253 0
Purchases of equipment and leasehold improvements (2,932) (2,079)
Payment for intangible assets acquired (660) (8,041)
Net cash used in investing activities (3,082) (20,120)
Cash flows from financing activities:    
Repayments of long-term debt (11,256) (12,120)
Proceeds from exercise of stock options 2,281 1,938
Purchase of subsidiary shares from noncontrolling interest (6,087) (808)
Dividends paid (17,279) (13,130)
Dividends paid to noncontrolling interest (9,654) (8,706)
Net cash (used in) financing activities (41,995) (32,826)
Effect of exchange rate changes on cash (1,877) (4,026)
Net decrease in cash and cash equivalents (46,346) (63,025)
Cash and cash equivalents - beginning of period 193,136 208,343
Cash and cash equivalents - end of period 146,790 145,318
Cash paid for:    
Interest 1,156 853
Income taxes $ 12,615 $ 12,451