CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Cash Flows from Operating Activities:
Net income	$ 7,432	$ 9,063
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	2,855	2,416
Provision for doubtful accounts	545	(103)
Stock-based compensation expense	183	289
Deferred income taxes	38	34
Excess tax benefit from exercise of equity awards		(32)
Changes in assets and liabilities:
Accounts receivable	32,885	67,942
Inventories	(9,438)	5,431
Prepaid expenses and other current assets	1,016	(1,928)
Other non-current assets	22	(128)
Accounts payable	(6,177)	(52,359)
Accrued expenses and other liabilities	(3,936)	(7,156)
Net cash provided by operating activities	25,425	23,469
Cash Flows from Investing Activities:
Purchases of property and equipment	(1,487)	(2,078)
Net cash used for investing activities	(1,487)	(2,078)
Cash Flows from Financing Activities:
Dividend payment	(9,041)	(10,591)
Exercise of stock options	1,678
Excess tax benefit from exercise of equity awards		32
Payment of payroll taxes on stock-based compensation through shares withheld		(40)
Net cash used for financing activities	(7,363)	(10,599)
Increase in cash and cash equivalents	16,575	10,792
Cash and cash equivalents, beginning of period	49,180	80,188
Cash and cash equivalents, end of period	65,755	90,980
Non-cash Investing and Financing Activities:
Accrued capital expenditures	291	578
Supplemental Cash Flow Information:
Income taxes paid	$ 1,546	$ 7,638