Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Operating activities
Net income	$ 17,733	$ 17,673
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation, amortization and accretion	11,271	8,423
Amortization of debt related costs	696	935
Provision for excess and obsolete inventory	730	818
Stock-based compensation	2,107	992
Gain on sale of assets		(5,945)
Loss on extinguishment of debt	2,161
Other	781	118
Increases (decreases) in cash from operating assets and liabilities:
Accounts receivable	(6,368)	(2,009)
Inventory	(4,232)	525
Other current assets	(249)	393
Accounts payable	767	1,474
Accrued expenses and other liabilities	694	(1,982)
Net cash provided by operating activities	26,091	21,415
Investing activities
Proceeds from sale of assets	1,234	9,000
Capital expenditures	(8,301)	(2,388)
Other		74
Net cash (used in) provided by investing activities	(7,067)	6,686
Financing activities
Payments on long-term debt	(285,265)	(1,861)
Proceeds from issuance of long-term debt	274,313
Proceeds from stock option exercises	1,078
Payments for minimum statutory tax withholding related to net share settlement of equity awards	(1,557)
Deferred financing costs	(1,576)
Other	(74)	(11)
Net cash used in financing activities	(13,081)	(1,872)
Effect of foreign exchange rates on cash and cash equivalents	33	26
Net increase in cash and cash equivalents	5,976	26,255
Cash and cash equivalents, beginning of period	51,178	28,596
Cash and cash equivalents, end of period	$ 57,154	$ 54,851