Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating activities:
Net income	$ 80,296	$ 7,887	$ 74,526
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	54,305	46,637	29,468
Amortization	47,349	37,067	9,347
Share-based compensation expense	11,033	8,887	7,928
Charge for fair value write-up of acquired inventory sold	0	48,586	0
Provision for deferred income taxes	(13,313)	(44,716)	8,232
Charge for excess and obsolete inventory	8,311	4,513	3,963
Excess tax benefit from share-based compensation plans	(5,457)	(842)	(3,914)
Amortization of debt issuance costs	3,344	5,848	0
Other	(20,299)	2,209	(765)
Changes in operating assets and liabilities, net of effects of acquisitions:
Trade accounts receivable and notes receivable	5,212	(4,845)	(13,363)
Inventories	(26,670)	(11,608)	(441)
Accounts payable and other accrued liabilities	(28,686)	14,348	(4,408)
Other current assets	654	(1,699)	(414)
Income taxes payable and refundable income taxes	4,955	10,975	2,731
Other	(116)	3,176	(3,488)
Net cash provided by operating activities	120,918	126,423	109,402
Investing activities:
Acquisition of property and equipment	(71,977)	(57,733)	(60,360)
Acquisition of business, net of cash acquired	0	(809,390)	(13,358)
Proceeds from sale or maturities of short-term investments	7,692	13,778	20,000
Proceeds from sale of assets held for sale	0	0	6,500
Payments for non-compete agreements	0	(7,517)	0
Other	647	567	189
Net cash used in investing activities	(63,638)	(860,295)	(47,029)
Financing activities:
Proceeds from long-term debt	0	855,200	0
Payments of long-term debt	(100,000)	(88,650)	0
Payments for debt issuance costs	0	(20,747)	0
Issuance of common stock from employee stock plans	4,264	3,559	7,685
Taxes paid related to net share settlement of equity awards	(2,508)	(2,479)	0
Repurchase and retirement of common stock	0	0	(15,494)
Other	5,457	765	3,914
Net cash (used in) provided by financing activities	(92,787)	747,648	(3,895)
Effect of exchange rate changes on cash and cash equivalents	(4,367)	(8,503)	(4,471)
(Decrease) increase in cash and cash equivalents	(39,874)	5,273	54,007
Cash and cash equivalents at beginning of year	389,699	384,426	330,419
Cash and cash equivalents at end of year	349,825	389,699	384,426
Supplemental Cash Flow Information
Equipment purchases in accounts payable	3,757	3,702	6,950
Schedule of interest and income taxes paid:
Interest paid	35,126	21,919	72
Income taxes, net of refunds received	$ 16,060	$ 12,274	$ 10,208