Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 257,106	$ 625,408
Trade accounts and notes receivable, net of allowance for doubtful accounts of $803 and $860	200,395	183,434
Inventories	265,358	198,089
Deferred tax charges and refundable income taxes	21,647	18,012
Other current assets	29,720	32,665
Total current assets	774,226	1,057,608
Property, plant and equipment, net of accumulated depreciation of $456,669 and $427,766	380,259	359,523
Other assets:
Goodwill	529,933	359,688
Intangible assets, net of accumulated amortization of $304,416 and $281,439	361,429	182,430
Deferred tax assets and other noncurrent tax assets	10,980	9,103
Other	9,281	7,820
Total assets	2,066,108	1,976,172
Current liabilities:
Long-term debt, current maturities	0	100,000
Accounts payable	71,895	68,762
Accrued payroll and related benefits	56,831	64,860
Other accrued liabilities	56,828	34,514
Income taxes payable	18,708	22,835
Total current liabilities	204,262	290,971
Long-term debt, excluding current maturities, net of unamortized discount and debt issuance costs of $8,627 and $9,470	650,223	574,380
Pension benefit obligations and other liabilities	30,977	32,130
Deferred tax liabilities and other noncurrent tax liabilities	127,741	85,673
Commitments and contingent liabilities	0	0
Equity:
Preferred stock, par value $.01; 5,000,000 shares authorized; none issued and outstanding as of June 30, 2018 and December 31, 2017	0	0
Common stock, par value $.01; 400,000,000 shares authorized; issued and outstanding shares as of June 30, 2018 and December 31, 2017: 141,691,182 and 141,282,539	1,417	1,413
Additional paid-in capital	861,357	867,699
Retained earnings	222,381	147,418
Accumulated other comprehensive loss	(32,250)	(23,512)
Total equity	1,052,905	993,018
Total liabilities and equity	$ 2,066,108	$ 1,976,172