Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 1,686	$ (38,304)
Adjustments to reconcile net income (loss) to net cash flows from operating activities:
Depreciation expense	7,674	5,613
Amortization expense of assets and liabilities, net	161	113
Gain on involuntary conversion	(3,543)	0
Accretion of convertible note discount	1,203	1,158
Change in fair value of contingent consideration	(15)	293
Provision for doubtful accounts	(160)	(816)
Stock compensation expense	1,076	1,080
Deferred tax benefit	(166)	(938)
Other operating activities	(117)	199
Changes in asset and liabilities, net of effects from acquisitions:
Accounts receivable, net	204,628	242,572
Inventories	(45,789)	(24,123)
Prepaid expenses and other assets	(10,817)	4,508
Accounts payable	10,008	(20,482)
Accrued expenses and other liabilities	(2,543)	(6,851)
Net cash flows provided by operating activities	163,286	164,022
CASH FLOWS FROM INVESTING ACTIVITIES:
Cash received from maturities of marketable securities	0	13,733
Cash receipts for involuntary conversion	3,543	0
Transfer out of restricted cash	0	12,845
Cash paid for purchase of property, plant and equipment	(14,770)	(12,178)
Cash paid for acquisitions and additional interests, net of cash acquired	(12,720)	(4,064)
Cash paid for investments	(3,249)	0
Net cash flows provided by (used in) investing activities	(27,196)	10,336
CASH FLOWS FROM FINANCING ACTIVITIES:
Net repayments on Wells Fargo Revolver	(23,149)	(15,325)
Borrowings on other lines of credits	2,820	0
Cash received from notes payable	7,537	0
Cash paid on notes payable	(1,312)	(1,317)
Cash paid for debt issuance costs	(112)	(317)
Cash paid for treasury stock	(4,873)	(5,000)
Cash paid for contingent consideration settlement	(581)	(1,052)
Net cash flows used in financing activities	(19,670)	(23,011)
NET CHANGE IN CASH AND CASH EQUIVALENTS	116,420	151,347
CASH AND CASH EQUIVALENTS, Beginning of period	47,081	63,516
Effect of exchange rate changes on cash	551	(1,318)
CASH AND CASH EQUIVALENTS, End of period	164,052	213,545
SUPPLEMENTAL DISCLOSURES OF CASH FLOWS INFORMATION:
Cash paid for income taxes	122	0
Cash paid for interest	1,027	715
Amounts included in period-end accounts payable for:
Purchases of property, plant and equipment	6,224	3,511
Debt issuance cost	50	28
Incentive stock liability for raw material supply agreement	0	70
Treasury stock	944	0
Issuance of common stock for acquisitions	4,050	0
Contingent consideration for acquisitions	$ 4,500	$ 0