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Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating activities
Net income	$ 76,588	$ 51,778	$ 42,707
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	26,754	18,474	17,485
Share-based Compensation, Total	10,928	8,558	6,775
Deferred taxes	11,936	1,174	2,780
Loss on impairment of assets		513	455
Gain on sale of business	(671)
Amortization of held-to-maturity securities	374	1,063	1,173
Other	(619)	(153)	(1,541)
Changes in operating assets and liabilities, net of acquisitions:
Accounts receivable	(6,098)	(9,933)	900
Inventories	(189)	(985)	136
Prepaid expenses and other	(2,098)	(691)	(1,312)
Income taxes	(6,652)	1,646	8,207
Accounts payable	1,942	3,176	(1,116)
Accrued liabilities and other	10,734	7,128	850
Net cash provided by operating activities	122,929	81,748	77,499
Investing activities
Purchases of property, equipment and other capital assets	(87,104)	(32,635)	(33,616)
Cash used for acquisitions, net of cash acquired	(90)	(110,533)
Proceeds from sale of business	284
Purchases of other assets and investments	(126)	(8,742)
Purchases of marketable securities	(41,384)	(20,037)	(89,315)
Proceeds from maturities of marketable securities	65,139	47,972	62,176
Net cash used in investing activities	(63,281)	(123,975)	(60,755)
Financing activities
Payments on debt	(5,000)
Proceeds from issuance of debt		5,000
Acquisition-related contingent consideration			(400)
Repurchases of common stock	(12,229)	(4,410)
Proceeds from exercises of stock options and other	6,791	8,602	5,715
Net cash (used in) provided by financing activities	(10,438)	9,192	5,315
Effect of exchange rate changes on cash and cash equivalents	(871)	947	(917)
Net increase (decrease) in cash and cash equivalents	48,339	(32,088)	21,142
Cash and cash equivalents, beginning of period	36,707	68,795	47,653
Cash and cash equivalents, end of period	85,046	36,707	68,795
Supplemental cash flow disclosure
Cash paid for interest	39	19	1
Cash paid for taxes	$ 9,966	$ 19,113	$ 9,802

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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Amount of cash outflow through purchase of long-term held-to-maturity securities.

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Amount of cash outflow to acquire investments classified as other.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

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-SubTopic 10
-Section 45
-Paragraph 12
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The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

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Amount of cash inflow from issuance of shares under share-based compensation arrangement. Issuance includes, but is not limited to, exercise of stock options and similar instruments.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period.

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No definition available.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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No definition available.

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