Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating Activities:
Net Income	$ 35,133	$ 24,321	$ 11,203
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	31,249	30,627	23,282
Deferred income tax expense (benefit)	(47)	789	(599)
(Gain) loss on revaluation of derivatives	(2,678)	167	6,118
Debt extinguishment expenses			960
Stock compensation	2,636	1,252	2,073
Loss on sale of property, plant & equipment	106	555	35
Provision for doubtful accounts	(705)	533	1,241
Defined benefit pension plan expense	(659)	50	266
Excess tax benefit from equity awards	(2,074)	(171)	(3,257)
(Gain) loss from equity investment	(436)	82	243
Changes in operating assets and liabilities:
Accounts receivable	(13,828)	(18,367)	(12,639)
Inventory	(9,600)	(5,847)	(4,624)
Prepaid expenses and other assets	(9,446)	(3,228)	1,937
Accounts payable	18,255	1,788	4,722
Accrued liabilities	11,888	4,314	3,266
Net cash provided by operating activities	59,794	36,865	34,227
Investing Activities:
Purchases of derivative financial instruments		(7,787)
Sales and maturities of short-term investments			9,761
Purchase of non-controlling interest	(48,567)
Investment in subsidiary, net of cash acquired			(113,432)
Equity investment			(491)
Loan to equity investment		(590)	(860)
Cash invested in corporate owned life insurance	(266)	(265)	(266)
Purchases of property and equipment	(35,861)	(26,793)	(10,636)
Patent Costs			(37)
Proceeds from the sale of property and equipment	11	40
Net cash used in investing activities	(84,683)	(35,395)	(115,961)
Financing Activities:
Distribution paid to non-controlling interest	(3)	(290)
Cash paid for financing costs		(264)	(4,493)
Borrowing of Debt	45,669	3,326	138,168
Repayments of Debt	(24,496)	(22,953)	(110,775)
Proceeds from public offering of common stock		75,532
Proceeds from the sale of Series C Convertible Preferred Stock			61,403
Proceeds from the sale of embedded derivatives			2,610
Excess tax benefit from equity awards	2,074	171	3,257
Redemption of Series C Preferred Stock	(8,446)	(23,340)	(7,780)
Series C Preferred Stock Holders dividend	(696)	(2,400)	(1,362)
Proceeds from the exercise of Common Stock options	4,801	774	3,345
Net cash provided by financing activities	18,903	32,477	85,548
Foreign currency effect on cash and cash equivalents	2,719	366	(6,559)
Net (decrease) increase in cash and cash equivalents	(3,267)	34,313	(2,745)
Cash and cash equivalents at beginning of period	58,152	23,839	26,584
Cash and cash equivalents at end of period	54,885	58,152	23,839
Supplemental disclosure of cash flow information:
Cash paid for interest	2,653	3,545	3,963
Cash paid for taxes	11,326	8,445	5,322
Supplemental disclosure of non-cash transactions:
Issuance of Common Stock to non-controlling interest	42,517	7,780	7,780
Issuance of Common Stock for Series C Preferred Stock conversion	15,108	1,031	2,242
Capital Lease	3,254
Common stock issued to directors and employees	1,509	429	669
W.E.T
Financing Activities:
Proceeds from sale of W.E.T. equity to non-controlling interest		$ 1,921	$ 1,175