Condensed Consolidated Balance Sheets - USD ($) $ in Thousands		Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents		$ 19,611	$ 12,175
Accounts receivable, net of allowance of $9,633 and $9,990, respectively	[1]	214,361	245,617
Inventory		36,361	39,195
Income tax receivable		1,001	316
Prepaid expenses and other current assets		33,212	20,275
Total current assets		304,546	317,578
Property, plant and equipment, net		173,049	191,951
Operating lease right-of-use assets		62,082	67,048
Intangible assets, net of accumulated amortization of $107,459 and $96,797, respectively		106,602	117,019
Goodwill		89,895	282,006
Deferred income taxes		5,167	5,189
Other assets, net		11,522	4,426
Total assets		752,863	985,217
Current liabilities:
Accounts payable		42,022	41,636
Current portion of long-term debt and finance lease obligations		5,323	5,294
Current portion of operating lease obligations		16,977	17,100
Other accrued liabilities		64,517	86,506
Total current liabilities		128,839	150,536
Long-term debt and finance lease obligations		338,872	325,299
Operating lease obligations		50,598	54,436
Defined benefit pension liability		5,817	9,321
Deferred income taxes		3,893	6,996
Other long-term liabilities		11,344	1,959
Total liabilities		539,363	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; 30,627,882 and 30,518,793 shares issued, respectively		9,183	9,153
Additional paid-in capital		412,727	409,034
Retained earnings (deficit)		(174,689)	48,673
Accumulated other comprehensive loss		(33,721)	(30,190)
Total equity		213,500	436,670
Total liabilities and equity		$ 752,863	$ 985,217

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