Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Operating activities
Net income	$ 31,667	$ 40,518	$ 123,385
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation, amortization and accretion	13,379	13,929	19,231
Amortization of debt related costs	978	1,279	1,361
Provision for bad debt	146	321	136
Provision for excess and obsolete inventory	1,851	2,875	1,215
Stock-based compensation	12,492	8,718	5,928
Loss on impairment of land	0	0	912
Loss on extinguishment of debt	3,196	0	2,442
Deferred taxes	9,725	5,762	(86,946)
Long-term income tax receivable	10,635	(2,855)	(8,413)
Long-term income tax payable and other long-term liabilities	(13,156)	3,219	2,793
Other	422	1,399	1,049
Increases (decreases) in cash from operating assets and liabilities:
Accounts receivable	156	(3,985)	(3,407)
Inventory	1,994	(8,690)	(9,620)
Other current assets	(2,411)	(661)	(388)
Accounts payable	3,233	(2,886)	604
Accrued expenses and other liabilities	6,077	2,250	4,495
Net cash provided by operating activities	80,384	61,193	54,777
Investing activities
Capital expenditures	(22,061)	(20,132)	(17,543)
Proceeds from sale of assets	0	1,000	1,234
Net cash used in investing activities	(22,061)	(19,132)	(16,309)
Financing activities
Proceeds from issuance of common stock	573	428	187
Payments for public offering costs	0	0	(74)
Proceeds from issuance of long-term debt	199,461	0	274,313
Payments on long-term debt and other borrowings	(275,376)	(2,862)	(286,694)
Deferred financing costs	(2,258)	0	(1,576)
Proceeds from stock option exercises	1,173	1,152	3,247
Payments for minimum statutory tax withholding related to net share settlement of equity awards	(2,454)	(3,386)	(2,853)
Net cash used in financing activities	(78,881)	(4,668)	(13,450)
Effect of foreign exchange rates on cash and cash equivalents	76	(282)	94
Net (decrease) increase in cash and cash equivalents	(20,482)	37,111	25,112
Cash and cash equivalents, beginning of year	113,401	76,290	51,178
Cash and cash equivalents, end of year	92,919	113,401	76,290
Supplemental disclosure of cash flow information
Interest	12,253	15,869	16,653
Income taxes, net of refunds of $2, $35 and $17, respectively	274	90	106
Schedule of non-cash investing and financing activities
Additions of property, plant and equipment included in liabilities	$ 4,175	$ 7,395	$ 2,738