Equity	12 Months Ended
Dec. 31, 2013
Equity [Abstract]
Equity	Equity Treasury Stock On July 18, 2007, the Company entered into a stock repurchase agreement with Navistar, pursuant to which the Company repurchased 3,600,000 shares of the Company's common stock, from Navistar in a privately negotiated transaction at $7.25 per share, for a total purchase price of $26,100,000. The Company also incurred approximately $115,000 in costs related to the stock repurchase agreement, which were recorded as part of the cost of its treasury stock. Navistar remains a major customer, accounting for approximately 33% and 39% of the Company's sales in 2013 and 2012, respectively. During 2013 and 2012, employees surrendered 36,329 and 31,455 shares, respectfully, of the Company's common stock to satisfy income tax withholding obligations in connection with the vesting of restricted stock. Anti‑takeover Measures The Company's Certificate of Incorporation and By‑laws contain certain provisions designed to discourage specific types of transactions involving an actual or threatened change of control of the Company. These provisions, which are designed to make it more difficult to change majority control of the Board of Directors without its consent, include provisions related to removal of Directors, the approval of a merger and certain other transactions as outlined in the Certificate of Incorporation and any amendments to those provisions. Restrictions on Transfer On July 16, 2007, the Board of Directors approved a Shareholders Rights Plan (the “Plan”) in conjunction with the approval of the repurchase of shares of stock from Navistar. The Plan was implemented to protect the interests of the Company's stockholders by encouraging potential buyers to negotiate directly with the Board prior to attempting a takeover. Under the Plan, each stockholder will receive a dividend of one right per share of common stock of the Company owned on the record date, July 18, 2007. The rights will not initially be exercisable until, subject to action by the Board of Directors, a person acquires 15% or more of the voting stock without approval of the Board. If the rights become exercisable, all holders except the party triggering the rights shall be entitled to purchase shares of the Company at a discount. Each right entitles the registered holder to purchase from the Company a unit consisting of one one-thousandth of a share of Series A Junior Participating Preferred Stock, par value $0.01 per share. In connection with the adoption of the Rights Agreement, on July 18, 2007, the Company filed a Certificate of Designations of Series A Junior Participating Preferred Stock with the Secretary of State of the State of Delaware.

Equity

12 Months Ended

Dec. 31, 2013

Treasury Stock

On July 18, 2007, the Company entered into a stock repurchase agreement with Navistar, pursuant to which the Company repurchased 3,600,000 shares of the Company's common stock, from Navistar in a privately negotiated transaction at $7.25 per share, for a total purchase price of $26,100,000. The Company also incurred approximately $115,000 in costs related to the stock repurchase agreement, which were recorded as part of the cost of its treasury stock. Navistar remains a major customer, accounting for approximately 33% and 39% of the Company's sales in 2013 and 2012, respectively.

During 2013 and 2012, employees surrendered 36,329 and 31,455 shares, respectfully, of the Company's common stock to satisfy income tax withholding obligations in connection with the vesting of restricted stock.

Anti‑takeover Measures

The Company's Certificate of Incorporation and By‑laws contain certain provisions designed to discourage specific types of transactions involving an actual or threatened change of control of the Company. These provisions, which are designed to make it more difficult to change majority control of the Board of Directors without its consent, include provisions related to removal of Directors, the approval of a merger and certain other transactions as outlined in the Certificate of Incorporation and any amendments to those provisions.

Restrictions on Transfer

On July 16, 2007, the Board of Directors approved a Shareholders Rights Plan (the “Plan”) in conjunction with the approval of the repurchase of shares of stock from Navistar. The Plan was implemented to protect the interests of the Company's stockholders by encouraging potential buyers to negotiate directly with the Board prior to attempting a takeover. Under the Plan, each stockholder will receive a dividend of one right per share of common stock of the Company owned on the record date, July 18, 2007. The rights will not initially be exercisable until, subject to action by the Board of Directors, a person acquires 15% or more of the voting stock without approval of the Board. If the rights become exercisable, all holders except the party triggering the rights shall be entitled to purchase shares of the Company at a discount. Each right entitles the registered holder to purchase from the Company a unit consisting of one one-thousandth of a share of Series A Junior Participating Preferred Stock, par value $0.01 per share. In connection with the adoption of the Rights Agreement, on July 18, 2007, the Company filed a Certificate of Designations of Series A Junior Participating Preferred Stock with the Secretary of State of the State of Delaware.