Condensed Consolidated Balance Sheets - USD ($) $ in Thousands		Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents		$ 15,084	$ 18,288
Receivables, net of allowance of $14,483 and $15,182	[1]	244,306	268,352
Inventory		49,501	48,540
Income tax receivable		5	331
Prepaid expenses and other current assets		24,532	19,445
Total current assets		333,428	354,956
Property, plant and equipment, net		192,567	194,794
Intangible assets, net of accumulated amortization of $86,060 and $82,406		127,701	131,372
Operating lease right-of-use assets		67,651	0
Goodwill		281,655	281,650
Other assets, net		7,079	7,397
Deferred income taxes		8,035	7,652
Total assets		1,018,116	977,821
Current liabilities:
Current portion of long-term debt and finance lease obligations		292	569
Current portion of operating lease obligations		17,667	0
Accounts payable		48,631	44,074
Other accrued liabilities		86,124	95,308
Total current liabilities		152,714	139,951
Deferred income taxes		5,712	6,106
Long-term debt and finance lease obligations		354,503	356,814
Operating lease obligations		54,951	0
Defined benefit pension liability		10,596	10,940
Other long-term liabilities		3,423	6,910
Total liabilities		581,899	520,721
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; 30,247,162 and 30,184,330 shares issued, respectively		9,072	9,053
Additional paid-in capital		403,063	400,989
Retained earnings		56,455	81,450
Accumulated other comprehensive loss		(32,373)	(34,392)
Total equity		436,217	457,100
Total liabilities and equity		$ 1,018,116	$ 977,821

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