Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating activities
Net income (loss)	$ 123,385	$ 26,762	$ (14,746)
Adjustments to reconcile net income (loss) to net cash flows from operating activities:
Depreciation, amortization and accretion	19,231	18,263	19,651
Amortization of debt related costs	1,361	1,603	2,431
Write-off of deferred offering and financing costs	0	0	236
Provision for bad debt	136	53	773
Provision for excess and obsolete inventory	1,215	1,342	1,359
Stock-based compensation	5,928	2,524	2,002
Gain on sales of assets	0	(6,385)	0
Loss on impairment of land	912	0	0
Loss on extinguishment of debt and debt retirement costs	2,442	1,896	15,528
Deferred taxes	(86,946)	(155)	99
Long-term income tax receivable	(8,413)	(200)	230
Long-term income tax payable and other long-term liabilities	2,793	565	638
Other	1,049	1,284	1,795
Increases (decreases) in cash from operating assets and liabilities:
Accounts receivable	(3,407)	(1,059)	(14)
Inventory	(9,620)	(3,626)	(2,609)
Other current assets	(388)	(155)	(132)
Accounts payable	604	5,700	(1,680)
Income taxes	(30)	(112)	187
Accrued expenses and other liabilities	4,525	1,342	(3,986)
Net cash provided by operating activities	54,777	49,642	21,762
Investing activities
Capital expenditures	(17,543)	(7,398)	(13,151)
Proceeds from sale of assets	1,234	10,605	0
Other	0	74	0
Net cash (used in) provided by investing activities	(16,309)	3,281	(13,151)
Financing activities
Proceeds from issuance of common stock	187	50,900	73,539
Payments for public offering costs	(74)	(2,006)	(6,925)
Proceeds from issuance of long-term debt	274,313	0	360,438
Payments on long-term debt	(286,694)	(78,729)	(1,900)
Payments on senior notes	0	0	(400,000)
Payment for call premium on senior notes	0	0	(9,752)
Deferred financing costs	(1,576)	(11)	(6,304)
Net movement in line of credit	0	0	(8,000)
Proceeds from stock option exercises	3,247	231	0
Payments for minimum statutory tax withholding related to net share settlement of equity awards	(2,853)	(602)	(97)
Net cash (used in) provided by financing activities	(13,450)	(30,217)	999
Effect of foreign exchange rates on cash and cash equivalents	94	(124)	(753)
Net increase in cash and cash equivalents	25,112	22,582	8,857
Cash and cash equivalents, beginning of year	51,178	28,596	19,739
Cash and cash equivalents, end of year	76,290	51,178	28,596
Supplemental disclosure of cash flow information
Interest	16,653	24,441	40,788
Income taxes, net of refunds of $17, $82 and $363, respectively	106	265	174
Schedule of non-cash investing and financing activities
Additions of property, plant & equipment included in liabilities	2,738	4,990	1,125
Receivable in connection with sale of Australian subsidiary	$ 0	$ 1,479	$ 0