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Fair Value (Tables) (West Construction, Inc.)	3 Months Ended
Fair Value (Tables) (West Construction, Inc.)	Mar. 31, 2013
West Construction, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value measurement of fixed assets and goodwill on a non-recurring basis	In 2012, we acquired the assets of West Construction, which requires the fair value of the earnout liability to be re-assessed on a not less than quarterly basis. In the first quarter of 2013, the Company performed this re-assessment and did not change the fair value of its liability of $271,000.

Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3).

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