Consolidated Condensed Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Operating Activities:
Net income	$ 27,052	$ 29,270
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	33,281	38,721
Deferred income taxes	5,072	(19)
Stock compensation	5,268	6,360
Defined benefit plan income	(754)	(219)
Provision of doubtful accounts	209	247
Loss on sale of property and equipment	319	2,273
Operating lease expense	4,477
Impairment loss	21,206	11,476
Gain on sale of business	(4,970)
Other	189
Changes in assets and liabilities:
Accounts receivable	(6,170)	(13,855)
Inventory	(5,512)	(3,510)
Prepaid expenses and other assets	9,594	(7,867)
Accounts payable	(3,097)	8,376
Accrued liabilities	(2,172)	(712)
Net cash provided by operating activities	83,992	70,541
Investing Activities:
Proceeds from the sale of property and equipment	137	703
Proceeds from sale of a business	47,500
Acquisition of subsidiary, net of cash acquired	(14,823)	(15)
Purchases of property and equipment	(18,340)	(31,815)
Net cash provided by (used in) investing activities	14,474	(31,127)
Financing Activities:
Borrowing of debt	29,470	18,000
Repayments of debt	(69,049)	(61,210)
Cash paid for financing costs	(1,278)
Cash paid for the cancellation of restricted stock	(1,213)	(882)
Proceeds from the exercise of Common Stock options	13,879	14,062
Repurchase of Common Stock	(58,040)	(64,151)
Net cash used in financing activities	(86,231)	(94,181)
Foreign currency effect	(4,151)	(1,253)
Net increase (decrease) in cash, cash equivalents and restricted cash	8,084	(56,020)
Cash, cash equivalents and restricted cash at beginning of period	39,620	103,172
Cash, cash equivalents and restricted cash at end of period	47,704	47,152
Supplemental disclosure of cash flow information:
Cash paid for taxes	6,676	19,255
Cash paid for interest	3,437	3,617
Supplemental disclosure of non-cash transactions:
Common Stock issued to Board of Directors and employees	$ 4,576	$ 3,893