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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Operating Activities:    
Net income $ 12,947 $ 11,334
Adjustments to reconcile net income to net cash provided (used) by operating activities:    
Depreciation and amortization 8,846 8,326
Amortization of debt issuance costs 410 409
Deferred income taxes 417  
(Gain)/loss on disposal of assets (8) 3
Non-cash gain from deconsolidation of bankrupt subsidiary   (209)
Share-based compensation expense 884 116
Change in value of long-term note receivable (173) (126)
Changes in operating assets and liabilities:    
Accounts receivable (5,383) (19,141)
Inventories 137 (1,668)
Accounts payable (7,518) (627)
Other assets and liabilities 1,074 (434)
Net cash provided (used) by operating activities 11,633 (2,017)
Investing Activities:    
Acquisition of property, plant and equipment (9,090) (10,173)
Proceeds received from long-term note receivable 1,945  
Cash lost on deconsolidation of Eltmann subsidiary   (979)
Proceeds from disposals of property, plant and equipment 368 106
Net cash used by investing activities (6,777) (11,046)
Financing Activities:    
Proceeds from short-term debt 148 941
Principal payment on capital lease (57) (32)
Proceeds from long term debt 3,286 12,486
Proceeds from issuance of stock 6 2,302
Debt issuance costs paid   (334)
Net cash provided by financing activities 3,383 15,363
Effect of exchange rate changes on cash flows (773) 2,067
Net Change in Cash 7,466 4,367
Cash at Beginning of Period 4,536 5,556
Cash at End of Period $ 12,002 $ 9,923