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Consolidated Condensed Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Operating Activities:    
Net income $ 16,579 $ 9,909
Adjustments to reconcile net income to cash provided by operating activities:    
Depreciation and amortization 7,473 7,934
Deferred tax provision (1,804) (740)
Stock compensation 870 491
Defined benefit plan (income) expense 1 (53)
Provision of doubtful accounts (4) 434
Gain on revaluation of financial derivatives (557) (1,244)
Gain on equity investment   (176)
Loss on sale of property, plant and equipment 24 3
Excess tax benefit from equity awards (2,173)  
Gain realized from step acquisition of subsidiary (785)  
Changes in operating assets and liabilities:    
Accounts receivable (21,153) (7,765)
Inventory 457 427
Prepaid expenses and other assets (5,786) (1,511)
Accounts payable 2,798 (160)
Accrued liabilities 904 2,490
Net cash (used in) provided by operating activities (3,156) 10,039
Investing Activities:    
Purchase of non-controlling interest   (40,302)
Investment in subsidiary, net of cash acquired (628)  
Proceeds from the sale of property, plant and equipment 44 1
Purchase of property and equipment (6,769) (6,116)
Net cash used in investing activities (7,353) (46,417)
Financing Activities:    
Borrowing of debt 13,455 40,441
Repayments of debt (6,965) (5,182)
Excess tax benefit from equity awards 2,173  
Cash paid to Series C Preferred Stock Holders   (8,268)
Proceeds from the exercise of common stock options 1,634 1,487
Net cash provided by financing activities 10,297 28,478
Foreign currency effect 2,978 (2,275)
Net increase (decrease) in cash and cash equivalents 2,766 (10,175)
Cash and cash equivalents at beginning of period 54,885 58,152
Cash and cash equivalents at end of period 57,651 47,977
Supplemental disclosure of cash flow information:    
Cash paid for taxes 4,689 1,519
Cash paid for interest 725 474
Supplemental disclosure of non-cash transactions:    
Common stock issued to Board of Directors and employees 495 269
Issuance of common stock to non-controlling interest   42,534
Issuance of common stock for Series C Preferred Stock conversion   $ 1,655