Employee Retirement Plans (Details Textual)	3 Months Ended
Mar. 31, 2012
Employee Retirement Plans (Textual) [Abstract]
Description of Multiemployer Plan	Company participates in 20 regional multi-employer pension plans, principally related to building trades; none of the plans are considered significant

- Definition

General descriptive information regarding an employer's multiemployer plans. A multiemployer plan is a plan to which two or more unrelated employers contribute, usually pursuant to one or more collective-bargaining agreements. A characteristic of multiemployer plans is that assets contributed by one participating employer may be used to provide benefits to employees of other participating employers since assets contributed by one employer are not segregated in a separate account or restricted to provide benefits only to employees of that employer. A multiemployer plan is usually administered by a board of trustees composed of management and labor representatives and may also be referred to as a "joint trust" or "union" plan. Generally, many employers participate in a multiemployer plan, and an employer may participate in more than one plan. The employers participating in multiemployer plans usually have a common industry bond, but for some plans the employers are in different industries and the labor union may be their only common bond.

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