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Investment in unconsolidated 50% or less owned joint ventures Investment in unconsolidated 50% or less owned joint ventures (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule of Equity Method Investments [Line Items]
Current assets	$ 53,299	$ 52,098
Non-current assets	45,996	46,928
Current liabilities	27,530	28,437
Non-current liabilities	1,551	977
Net sales	96,498	88,312	105,845
Gross profit	17,670	13,439	16,577
Income from continuing operations	$ 6,433	$ 7,101	$ 8,859
BHH [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	40.00%
Mincenco and Klafi [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage	50.00%

The amount of current assets reported by an equity method investment of the entity.

The amount of current liabilities reported by an equity method investment of the entity.

The amount of gross profit (loss) reported by an equity method investment of the entity.

The amount of net income (loss) reported by an equity method investment of the entity.

The amount of noncurrent assets reported by an equity method investment of the entity.

The amount of noncurrent liabilities reported by an equity method investment of the entity.