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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash flows from operating activities:      
Net income $ 24,268 $ 20,937 $ 6,416
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 17,643 17,016 19,195
Amortization of debt issue costs 824 809 1,415
(Gain) loss on disposal of assets (17) (36) 808
Allowance for doubtful accounts 98 140 97
Compensation expense from issuance of restricted stock and incentive stock options 1,788 828 1,253
Deferred income tax expense (benefit) (7,067) (968) 418
Capitalized interest and non-cash interest (173) (210)  
Non-cash restructuring and impairment charges 967   308
Write-off of unamortized debt issue costs     130
Changes in operating assets and liabilities:      
Accounts receivable 15,330 (7,539) (15,459)
Inventories 238 (7,079) (10,253)
Income tax receivable (1,163) (419) 2,393
Other current assets (405) (1,658) 740
Other non-current assets (21) 7 (1,403)
Accounts payable (11,630) (4,790) 19,165
Other liabilities (3,322) (2,083) 2,637
Net cash provided by operating activities 37,358 14,955 27,860
Cash flows from investing activities:      
Acquisition of property, plant and equipment (17,089) (20,329) (15,249)
Proceeds from disposals of property, plant and equipment 366 255 79
Cash lost in deconsolidation of Eltmann   (979)  
Proceeds received from long-term note receivable 1,945   711
Net cash used by investing activities (14,778) (21,053) (14,459)
Cash flows from financing activities:      
Debt issue costs paid (862) (453) (1,395)
Proceeds from long-term debt, net   20,000  
Repayment of long-term debt, net (7,914) (16,014) (9,914)
Proceeds (repayment) of short-term debt, net (701) 789 (3,691)
Proceeds from issuance of stock and exercise of stock options 22 2,382 753
Principal payments on capital lease (119) (66) (57)
Net cash provided by (used by) financing activities (9,574) 6,638 (14,304)
Effect of exchange rate changes on cash flows 1,448 (1,560) (2,285)
Net change in cash and cash equivalents 14,454 (1,020) (3,188)
Cash and cash equivalents at beginning of year 4,536 5,556 8,744
Cash and cash equivalents at end of year 18,990 4,536 5,556
Supplemental schedule of non-cash investing and financing activities:      
Compensation expense for stock awards, ($695 in 2012, $348 in 2011, and $1,101 in 2010) and stock option expense ($1,093 in 2012, $480 in 2011, and $152 in 2010) included in stockholders' equity 1,788 828 1,253
Acquired land and building through a 20 year capital lease not included in investing activities above   1,948  
Sale of $2,230 in property, plant and equipment for a note receivable with an aggregate carrying value of $1,562 in 2010.     668
Cash paid for interest and income taxes was as follows:      
Interest 3,130 3,869 4,825
Income taxes 5,882 6,516 1,419
Income tax refunds received from taxing authorities $ 757 $ 149 $ 2,393