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Fair Value Measurements (Details) (Recurring [Member], USD $) In Thousands, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Financial assets |  |
Escrow account | $ 898 | $ 897
Deferred compensation plan assets | 5,280 | 4,575
Derivative Assets |  | 153
Total Assets | 6,178 | 5,625
Financial liabilities |  |
Derivative liabilities | (353) | (108)
Level 1 [Member] |  |
Financial assets |  |
Escrow account | 898 | 897
Deferred compensation plan assets | 5,280 | 4,575
Derivative Assets |  |
Total Assets | 6,178 | 5,472
Financial liabilities |  |
Derivative liabilities |  |
Level 2 [Member] |  |
Financial assets |  |
Escrow account |  |
Deferred compensation plan assets |  |
Derivative Assets |  | 153
Total Assets |  | 153
Financial liabilities |  |
Derivative liabilities | (353) | (108)
Level 3 [Member] |  |
Financial assets |  |
Escrow account |  |
Deferred compensation plan assets |  |
Derivative Assets |  |
Total Assets |  |
Financial liabilities |  |
Derivative liabilities |  |

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