CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash Flows provided by Operating Activities:
Net income	$ 14,896	$ 12,727
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	3,147	3,709
Provision for doubtful accounts	2,833	256
Stock-based compensation expense	624	269
Changes in assets and liabilities:
Accounts receivable	61,477	13,494
Inventories	(12,319)	(18,470)
Prepaid expenses, income tax receivables and other current assets	(3,300)	3,322
Other non-current assets	(98)	119
Accounts payable	(15,499)	2,121
Accrued expenses and other liabilities	(7,205)	551
Net cash provided by operating activities	44,556	18,098
Cash Flows used in Investing Activities:
Purchases of equipment	(4,595)	(6,572)
Net cash used in investing activities	(4,595)	(6,572)
Cash Flows used in Financing Activities:
Purchase of treasury shares	(10,222)	(1,294)
Dividend payment	(8,427)	(8,452)
Issuance of stock under Employee Stock Purchase Plan		(13)
Payment of payroll taxes on stock-based compensation through shares withheld	(49)
Net cash used in financing activities	(18,698)	(9,759)
Increase in cash and cash equivalents	21,263	1,767
Cash and cash equivalents, beginning of period	90,060	91,703
Cash and cash equivalents, end of period	111,323	93,470
Non-cash Investing and Financing Activities:
Accrued capital expenditures	1,237	1,987
Supplemental Cash Flow Information:
Income taxes paid	$ 369	$ 291