Fair Value (Tables) (West Construction, Inc.)	9 Months Ended
Fair Value (Tables) (West Construction, Inc.)	Sep. 30, 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, the Company acquired the assets of West Construction, which included an earnout provision, based on achievement of certain targets, which was measured at its fair value at acquisition and re-assessed on a quarterly basis. In the second quarter of 2013, the Company determined that the earnout would not be payable at the measurement date, and reduced its liability of $271,000 to zero, which is included as a component of other income in the Company's statement of operations for the nine month period.

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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