UNAUDITED CONDENSED CONSOLIDATED STATEMENT OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities:
Net loss	$ (9,096)	$ (20,565)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	22,600	23,145
Stock-based compensation	1,082	1,600
Amortization of deferred financing costs	1,266	1,163
Interest income on interest rate swap	0	(713)
Deferred income taxes	2,042	(5,668)
Provision (benefit) for bad debts	190	(81)
Loss on sales of property and equipment	56	126
Changes in operating assets and liabilities:
Accounts receivable	27,078	24,901
Inventories	(506)	(3,957)
Prepaid expenses and other current assets	(3,804)	(5,942)
Accounts payable	(6,243)	83
Accrued expenses and other liabilities	(3,848)	(4,545)
Income taxes payable	240	1,669
Other assets and liabilities	(181)	(2,061)
Net cash provided by operating activities	30,876	9,155
Cash flows from investing activities:
Capital expenditures	(1,304)	(905)
Net cash used in investing activities	(1,304)	(905)
Cash flows from financing activities:
Repayment of long-term debt	(10,729)	(2,683)
Payment for redemption of convertible preferred stock	(5,330)	0
Payment of preferred dividends	(6,065)	0
Proceeds from long-term debt	0	1,395
Proceeds from issuance of stock under employee stock purchase plan	163	197
Net cash used in financing activities	(21,961)	(1,091)
Effect of exchange rate changes on cash and cash equivalents and restricted cash	(947)	(1,357)
Net increase in cash and cash equivalents	6,664	5,802
Cash and cash equivalents, beginning of period	50,030	29,817
Cash and cash equivalents, end of period	56,694	35,619
Cash paid for:
Cash paid for interest	9,899	12,726
Cash paid for income taxes	2,196	2,345
Supplemental schedule of non-cash investing and financing activities:
Accrued purchases of property and equipment	$ 105	$ 419