Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating activities
Net income	$ 9,949	$ 8,211
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation, amortization and accretion	3,323	3,596
Amortization of debt related costs	320	320
Provision for bad debt	(190)	195
Provision for excess and obsolete inventory	511	1,220
Stock-based compensation	2,720	1,796
Deferred taxes	1,741	2,923
Long-term income tax receivable	(802)	(841)
Long-term income tax payable and other long-term liabilities	1,018	854
Other	(6)	(46)
Increases (decreases) in cash from operating assets and liabilities:
Accounts receivable	(1,040)	(7,816)
Inventory	465	(6,579)
Other current assets	(1,152)	(1,003)
Accounts payable	1,458	2,160
Accrued expenses and other liabilities	(7,847)	(5,656)
Net cash provided by (used in) operating activities	10,468	(666)
Investing activities
Capital expenditures	(10,550)	(2,135)
Proceeds from sales of assets	0	1,000
Net cash used in investing activities	(10,550)	(1,135)
Financing activities
Payments on long-term debt and other borrowings	(717)	(715)
Proceeds from stock option exercises	324	514
Proceeds from issuance of common stock	282	206
Payments for minimum statutory tax withholding related to net share settlement of equity awards	(1,120)	(709)
Net cash used in financing activities	(1,231)	(704)
Effect of foreign exchange rates on cash and cash equivalents	(27)	(46)
Net decrease in cash and cash equivalents	(1,340)	(2,551)
Cash and cash equivalents, beginning of period	113,401	76,290
Cash and cash equivalents, end of period	$ 112,061	$ 73,739