Condensed Consolidated Balance Sheets - USD ($) $ in Thousands		Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents		$ 20,523	$ 12,175
Accounts receivable, net of allowance of $9,674 and $9,990, respectively	[1]	224,111	245,617
Inventory		38,011	39,195
Income tax receivable		15,550	316
Prepaid expenses and other current assets		25,797	20,275
Total current assets		323,992	317,578
Property, plant and equipment, net		184,447	191,951
Operating lease right-of-use assets		64,209	67,048
Intangible assets, net of accumulated amortization of $99,899 and $96,797, respectively		113,535	117,019
Goodwill		88,099	282,006
Deferred income taxes		5,130	5,189
Other assets, net		8,126	4,426
Total assets		787,538	985,217
Current liabilities:
Accounts payable		47,634	41,636
Current portion of long-term debt and finance lease obligations		5,296	5,294
Current portion of operating lease obligations		16,787	17,100
Other accrued liabilities		81,699	86,506
Total current liabilities		151,416	150,536
Long-term debt and finance lease obligations		345,362	325,299
Operating lease obligations		52,027	54,436
Defined benefit pension liability		7,696	9,321
Deferred income taxes		1,821	6,996
Other long-term liabilities		1,787	1,959
Total liabilities		560,109	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; 30,627,479 and 30,518,793 shares issued, respectively		9,183	9,153
Additional paid-in capital		410,185	409,034
Retained earnings (deficit)		(152,088)	48,673
Accumulated other comprehensive loss		(39,851)	(30,190)
Total equity		227,429	436,670
Total liabilities and equity		$ 787,538	$ 985,217

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