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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Cash flows from operating activities:    
Net income $ 37,459 $ 33,580
Adjustments to reconcile net income to net cash used in operating activities:    
Depreciation and amortization 6,718 7,723
Provision for doubtful accounts 39 456
Noncash stock compensation 590 689
Deferred tax benefit (508) $ (799)
Change in fair value of derivatives 670
Changes in:    
Accounts receivable (44,778) $ (51,455)
Inventories (10,737) (3,566)
Other assets (2,106) (411)
Accounts payable and accrued expenses (6,189) (12,347)
Income taxes, net 6,346 12,931
Net cash used in operating activities (12,496) (13,199)
Cash flows from investing activities:    
Purchases of short-term investments (56,216) (248,193)
Proceeds from sale of short-term investments 141,009 214,975
Purchases of equipment and leasehold improvements (2,500) (2,584)
Payment for intangible assets acquired (119,541) (821)
Net cash used in investing activities $ (37,248) (36,623)
Cash flows from financing activities:    
Repayments of loans payable - banks, net $ (5,841)
Proceeds from issuance of long-term debt $ 111,440
Repayments of long-term debt (6,404)
Proceeds from exercise of options 451 $ 861
Proceeds from sale of stock of subsidiary 690 1,030
Dividends paid (11,775) (11,128)
Dividends paid to noncontrolling interest $ (3,836) (4,667)
Purchase of treasury stock (37)
Net cash provided by (used in) financing activities $ 90,566 (19,782)
Effect of exchange rate changes on cash (6,431) (5,861)
Net increase (decrease) in cash and cash equivalents 34,391 (75,465)
Cash and cash equivalents - beginning of period 90,138 125,650
Cash and cash equivalents - end of period 124,529 50,185
Cash paid for:    
Interest 1,688 1,028
Income taxes $ 16,692 $ 6,396