Condensed Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 8,810	$ (40,467)
Adjustments to reconcile net income (loss) to net cash flows from operating activities:
Depreciation expense	15,498	11,747
Amortization expense of assets and liabilities, net	354	213
Gain on involuntary conversion	(4,540)	0
Accretion of convertible note discount	2,462	2,327
Amortization of marketable securities	0	103
Change in fair value of contingent consideration	3,556	(1,828)
Change in fair value of convertible debt conversion liability	(13,432)	0
Gain on debt extinguishment	(2,152)	0
Provision for doubtful accounts	(34)	(986)
Stock compensation expense	1,934	2,236
Deferred tax expense (benefit)	1,709	(1,749)
Other operating activities	(504)	(11)
Changes in asset and liabilities, net of effects from acquisitions:
Accounts receivable, net	213,219	246,260
Inventories	(42,240)	1,473
Prepaid expenses and other assets	(41,158)	(987)
Accounts payable	(150,093)	(141,340)
Accrued expenses and other liabilities	(1,686)	(10,028)
Deferred revenue	1,757	(16,680)
Net cash flows provided by (used in) operating activities	(6,540)	50,283
CASH FLOWS FROM INVESTING ACTIVITIES:
Cash paid for marketable securities	0	(52,153)
Cash received from maturities of marketable securities	0	38,597
Cash receipts for involuntary conversion	4,540	0
Transfer into restricted cash	0	(2,000)
Transfer out of restricted cash	0	12,845
Cash paid for purchase of property, plant and equipment	(27,467)	(27,707)
Cash paid for acquisitions and additional interests, net of cash acquired	(12,720)	(4,171)
Cash paid for investments	(3,249)	0
Other investing activities	376	0
Net cash flows used in investing activities	(38,520)	(34,589)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net borrowings on revolving line of credit	21,373	9,661
Borrowings on other lines of credit	4,081	0
Cash received from notes payable	163,408	411
Cash paid on notes payable	(64,530)	(2,673)
Cash paid for debt issuance costs	(5,329)	(365)
Cash paid for treasury stock	(45,869)	(12,118)
Cash paid for contingent consideration settlement	(1,390)	(1,995)
Net cash flows provided by (used in) financing activities	71,744	(7,079)
NET CHANGE IN CASH AND CASH EQUIVALENTS	26,684	8,615
CASH AND CASH EQUIVALENTS, Beginning of period	47,081	63,516
Effect of exchange rate changes on cash	313	(1,153)
CASH AND CASH EQUIVALENTS, End of period	74,078	70,978
SUPPLEMENTAL DISCLOSURES OF CASH FLOWS INFORMATION:
Cash paid (received) for income taxes	244	(44)
Cash paid for interest	3,976	3,372
Amounts included in period-end accounts payable for:
Purchases of property, plant and equipment	4,135	8,812
Debt issuance cost	34	14
Incentive stock liability for raw material supply agreement	0	159
Issuance of common stock for acquisitions	4,050	0
Contingent consideration for acquisitions	4,500	0
Accruals of insurance proceeds related to impairment of property, plant and equipment	$ 1,414	$ 11,027