Condensed Consolidated Balance Sheets - USD ($) $ in Thousands		Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents		$ 22,344	$ 24,586
Receivables, net	[1]	194,214	194,066
Inventory		36,601	36,854
Income tax receivable		2,346	1,474
Prepaid expenses and other current assets		38,727	26,752
Total current assets		294,232	283,732
Property, plant and equipment, net		166,524	170,309
Operating lease right-of-use assets		68,183	63,869
Intangible assets, net		99,864	103,282
Goodwill		90,393	91,351
Deferred income taxes		5,438	6,790
Other assets, net		11,552	11,642
Total assets		736,186	730,975
Current liabilities:
Accounts payable		45,295	42,148
Current portion of long-term debt and finance lease obligations		352	337
Current portion of operating lease obligations		17,044	17,375
Other accrued liabilities		85,608	73,144
Total current liabilities		148,299	133,004
Long-term debt and finance lease obligations		332,723	312,159
Operating lease obligations		56,701	52,207
Defined benefit pension liability		4,122	5,282
Deferred income taxes		2,068	4,375
Other long-term liabilities		9,413	9,345
Total liabilities		553,326	516,372
Commitments and contingencies
Equity:
Preferred stock, 500,000 shares authorized, none issued		0	0
Common stock, par value $0.30 per share, 60,000,000 shares authorized; 30,893,447 and 30,874,437 shares issued		9,263	9,257
Additional paid-in capital		424,812	422,589
Retained deficit		(223,856)	(189,565)
Accumulated other comprehensive loss		(27,359)	(27,678)
Total equity		182,860	214,603
Total liabilities and equity		$ 736,186	$ 730,975

[1] Includes billed and unbilled amounts, net of allowance for credit losses. See Note 3 for details.