Consolidated Condensed Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating Activities:
Net income	$ 8,414	$ 12,966
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	11,052	12,892
Deferred income taxes	1,749	(707)
Stock compensation	1,968	2,202
Defined benefit plan (income) expense	(617)	298
Provision of doubtful accounts	229	41
Loss on sale of property and equipment	178	85
Operating lease expense	1,333
Impairment loss	10,484
Gain on sale of business	(4,970)
Changes in assets and liabilities:
Accounts receivable	(8,293)	(9,691)
Inventory	(229)	1,903
Prepaid expenses and other assets	(5,553)	(4,881)
Accounts payable	(2,079)	1,290
Accrued liabilities	(6,785)	(10,808)
Net cash provided by operating activities	6,881	5,590
Investing Activities:
Proceeds from the sale of property and equipment	28
Proceeds from sale of a business	47,500
Final payment for acquisition of subsidiary, net of cash acquired		(15)
Purchases of property and equipment	(5,150)	(8,378)
Net cash provided by (used in) investing activities	42,378	(8,393)
Financing Activities:
Borrowing of debt	10,428
Repayments of debt	(49,627)	(35,492)
Cash paid for the cancellation of restricted stock	(376)	(659)
Proceeds from the exercise of Common Stock options	214	751
Repurchase of Common Stock	(8,040)
Net cash used in financing activities	(47,401)	(35,400)
Foreign currency effect	(209)	5,513
Net increase (decrease) in cash, cash equivalents and restricted cash	1,649	(32,690)
Cash, cash equivalents and restricted cash at beginning of period	39,620	103,172
Cash, cash equivalents and restricted cash at end of period	41,269	70,482
Supplemental disclosure of cash flow information:
Cash paid for taxes	3,466	6,870
Cash paid for interest	1,252	981
Supplemental disclosure of non-cash transactions:
Common Stock issued to Board of Directors and employees	$ 1,581	$ 1,362