Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Operating activities
Net income	$ 4,138	$ 10,323
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation, amortization and accretion	6,160	4,113
Provision for excess and obsolete inventory	285	497
Stock-based compensation	945	407
Gain on sale of assets	0	(5,828)
Loss on extinguishment of debt	2,161	0
Other	643	986
Increases (decreases) in cash from operating assets and liabilities:
Accounts receivable	(3,135)	(2,634)
Inventory	(2,427)	(304)
Other current assets	(1,250)	(1,042)
Accounts payable	1,200	2,070
Accrued expenses and other liabilities	(3,196)	(4,808)
Net cash provided by operating activities	5,524	3,780
Investing activities
Proceeds from sale of assets	335	9,000
Capital expenditures	(4,899)	(1,652)
Redemption of certificate of deposit-restricted	0	74
Net cash (used in) provided by investing activities	(4,564)	7,422
Financing activities
Payments on long-term debt	(284,551)	(933)
Proceeds from issuance of long-term debt	274,313	0
Proceeds from stock option exercises	632	0
Payments for minimum statutory tax withholding related to net share settlement of equity awards	(355)	0
Deferred financing costs	(1,219)	0
Other	(74)	(11)
Net cash used in financing activities	(11,254)	(944)
Effect of foreign exchange rates on cash and cash equivalents	(2)	26
Net (decrease) increase in cash and cash equivalents	(10,296)	10,284
Cash and cash equivalents, beginning of period	51,178	28,596
Cash and cash equivalents, end of period	$ 40,882	$ 38,880