Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating activities
Net income	$ 8,211	$ 4,138
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation, amortization and accretion	3,596	6,160
Amortization of debt related costs	320	360
Provision for bad debt	195	62
Provision for excess and obsolete inventory	1,220	285
Stock-based compensation	1,796	945
Loss on extinguishment of debt and debt retirement costs	0	2,161
Deferred taxes	2,923	0
Long-term income tax receivable	(841)	(490)
Long-term income tax payable and other long-term liabilities	854	769
Other	(46)	(58)
Increases (decreases) in cash from operating assets and liabilities:
Accounts receivable	(7,816)	(3,135)
Inventory	(6,579)	(2,427)
Other current assets	(1,003)	(1,250)
Accounts payable	2,160	1,200
Accrued expenses and other liabilities	(5,656)	(3,196)
Net cash (used in) provided by operating activities	(666)	5,524
Investing activities
Capital expenditures	(2,135)	(4,899)
Proceeds from sales of assets	1,000	335
Net cash used in investing activities	(1,135)	(4,564)
Financing activities
Proceeds from issuance of long-term debt	0	274,313
Payments on long-term debt	(715)	(284,551)
Deferred financing costs	0	(1,219)
Payments for public offering costs	0	(74)
Proceeds from stock option exercises	514	632
Proceeds from issuance of common stock	206	0
Payments for minimum statutory tax withholding related to net share settlement of equity awards	(709)	(355)
Net cash used in financing activities	(704)	(11,254)
Effect of foreign exchange rates on cash and cash equivalents	(46)	(2)
Net decrease in cash and cash equivalents	(2,551)	(10,296)
Cash and cash equivalents, beginning of period	76,290	51,178
Cash and cash equivalents, end of period	$ 73,739	$ 40,882