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Consolidated Statements of Cash Flows (Parenthetical) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Consolidated Statements of Cash Flows [Abstract] |  |  |
Compensation expense for stock awards | $ 695 | $ 348 | $ 1,101
Stock option expense | 1,093 | 480 | 152
Capital Lease Obligation Period |  | 20 years |
Sale of property, plant and equipment |  |  | 2,230
Sale of property, plant and equipment aggregate carrying value |  |  | $ 1,562

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