Consolidated Condensed Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Operating Activities:
Net income	$ 15,437	$ 12,942
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	15,730	15,292
Deferred tax provision	(1,210)	884
Stock compensation	998	517
Defined benefit plan expense	(105)	(207)
Provision of doubtful accounts	(8)	(210)
Gain on revaluation of financial derivatives	(1,878)	(1,039)
Loss (gain) on equity investment	(197)	231
Loss (gain) on sale of property, plant and equipment	(16)	56
Excess tax benefit from equity awards	(204)	(1,068)
Changes in operating assets and liabilities:
Accounts receivable	(12,028)	(11,248)
Inventory	(2,835)	569
Prepaid expenses and other assets	(4,091)	(6,891)
Accounts payable	14,470	(46)
Accrued liabilities	2,372	7,187
Net cash provided by operating activities	26,435	16,969
Investing Activities:
Purchase of non-controlling interest	(46,827)
Purchase of derivative financial instruments		(7,787)
Proceeds from the sale of property, plant and equipment	9	18
Purchase of property and equipment	(18,032)	(8,126)
Loan to equity investment		(350)
Patent costs		(36)
Net cash used in investing activities	(64,850)	(16,281)
Financing Activities:
Borrowing of debt	46,280	81
Repayments of debt	(10,286)	(15,403)
Distributions paid to non-controlling interests		(290)
Proceeds from public offering of common stock		75,547
Excess tax benefit from equity awards	204	1,068
Cash paid to Series C Preferred Stock Holders	(8,945)	(8,776)
Proceeds from the exercise of Common Stock options	2,411	340
Net cash provided by financing activities	29,664	54,488
Foreign currency effect		(1,721)
Net increase (decrease) in cash and cash equivalents	(8,751)	53,455
Cash and cash equivalents at beginning of period	58,152	23,839
Cash and cash equivalents at end of period	49,401	77,294
Supplemental disclosure of cash flow information:
Cash paid for taxes	3,360	4,332
Cash paid for interest	1,368	2,146
Supplemental disclosure of non-cash transactions:
Common stock issued to Board of Directors and employees	374	149
Issuance of common stock to non-controlling interest	42,517
Issuance of common stock for Series C Preferred Stock conversion	8,276
W.E.T.
Financing Activities:
Proceeds from sale of W.E.T. equity to non-controlling interest		$ 1,921