Condensed Consolidated Balance Sheets - USD ($) $ in Thousands		Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents		$ 15,550	$ 12,175
Accounts receivable, net of allowance of $9,951 and $9,990, respectively	[1]	195,522	245,617
Inventory		36,810	39,195
Income tax receivable		2,529	316
Prepaid expenses and other current assets		31,317	20,275
Total current assets		281,728	317,578
Property, plant and equipment, net		181,310	191,951
Operating lease right-of-use assets		61,505	67,048
Intangible assets, net of accumulated amortization of $103,698 and $96,797, respectively		110,006	117,019
Goodwill		88,958	282,006
Deferred income taxes		5,881	5,189
Other assets, net		9,804	4,426
Total assets		739,192	985,217
Current liabilities:
Accounts payable		43,377	41,636
Current portion of long-term debt and finance lease obligations		5,316	5,294
Current portion of operating lease obligations		17,055	17,100
Other accrued liabilities		67,735	86,506
Total current liabilities		133,483	150,536
Long-term debt and finance lease obligations		321,094	325,299
Operating lease obligations		49,665	54,436
Defined benefit pension liability		6,619	9,321
Deferred income taxes		2,694	6,996
Other long-term liabilities		6,701	1,959
Total liabilities		520,256	548,547
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; 30,627,638 and 30,518,793 shares issued, respectively		9,183	9,153
Additional paid-in capital		411,600	409,034
Retained earnings (deficit)		(165,616)	48,673
Accumulated other comprehensive loss		(36,231)	(30,190)
Total equity		218,936	436,670
Total liabilities and equity		$ 739,192	$ 985,217

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