Consolidated Condensed Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating Activities:
Net income	$ 32,909	$ 11,873
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	9,854	10,406
Deferred income taxes	105	721
Non-cash stock based compensation	2,740	1,942
Change in defined benefit pension plans	(477)	85
Loss on sale of property and equipment	242	119
Operating lease expense	2,575	1,651
Changes in assets and liabilities:
Accounts receivable, net	(13,931)	(2,040)
Inventory	(11,546)	(404)
Other assets	555	(4,805)
Accounts payable	18,113	13,540
Other liabilities	(1,472)	(3,669)
Net cash provided by operating activities	39,667	29,419
Investing Activities:
Purchases of property and equipment	(9,913)	(3,231)
Acquisition of intangible assets		(3,141)
Proceeds from the sale of property and equipment	10	34
Other	(200)
Net cash used in investing activities	(10,103)	(6,338)
Financing Activities:
Borrowing of debt		169,546
Repayments of debt	(130,000)	(16,111)
Cash paid for the repurchase of Common Stock		(9,092)
Proceeds from the exercise of Common Stock options	5,984	5,902
Cash paid for the cancellation of restricted stock	(1,532)	(404)
Acquisition contingent consideration payment	(68)
Net cash (used in) provided by financing activities	(125,616)	149,841
Foreign currency effect	(1,338)	(426)
Net (decrease) increase in cash and cash equivalents	(97,390)	172,496
Cash and cash equivalents at beginning of period	268,345	52,948
Cash and cash equivalents at end of period	170,955	225,444
Supplemental disclosure of cash flow information:
Cash paid for taxes	2,555	3,525
Cash paid for interest	$ 844	$ 537