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Selected Quarterly Financial Data (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Selected quarterly financial data [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 148,650 us-gaap_SalesRevenueGoodsNet | $ 156,341 us-gaap_SalesRevenueGoodsNet | $ 99,439 us-gaap_SalesRevenueGoodsNet | $ 82,646 us-gaap_SalesRevenueGoodsNet | $ 91,016 us-gaap_SalesRevenueGoodsNet | $ 101,164 us-gaap_SalesRevenueGoodsNet | $ 93,981 us-gaap_SalesRevenueGoodsNet | $ 63,028 us-gaap_SalesRevenueGoodsNet | $ 487,076 us-gaap_SalesRevenueGoodsNet | $ 349,189 us-gaap_SalesRevenueGoodsNet | $ 286,594 us-gaap_SalesRevenueGoodsNet
Cost of sales | 120,781 us-gaap_CostOfGoodsSold | 128,250 us-gaap_CostOfGoodsSold | 81,493 us-gaap_CostOfGoodsSold | 68,576 us-gaap_CostOfGoodsSold | 73,108 us-gaap_CostOfGoodsSold | 81,132 us-gaap_CostOfGoodsSold | 78,717 us-gaap_CostOfGoodsSold | 53,932 us-gaap_CostOfGoodsSold | 399,100 us-gaap_CostOfGoodsSold | 286,952 us-gaap_CostOfGoodsSold | 240,115 us-gaap_CostOfGoodsSold
Net earnings | 2,020 us-gaap_NetIncomeLoss | 1,507 us-gaap_NetIncomeLoss | 3,065 us-gaap_NetIncomeLoss | 2,503 us-gaap_NetIncomeLoss | 7,397 us-gaap_NetIncomeLoss | 7,380 us-gaap_NetIncomeLoss | 1,689 us-gaap_NetIncomeLoss | (558)us-gaap_NetIncomeLoss | 9,095 us-gaap_NetIncomeLoss | 15,908 us-gaap_NetIncomeLoss | 2,373 us-gaap_NetIncomeLoss
Net earnings (Loss) per share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Restructuring charges |  |  |  |  |  |  |  |  | 1,832 us-gaap_RestructuringCharges | 1,387 us-gaap_RestructuringCharges | 5,245 us-gaap_RestructuringCharges
Class A [Member] |  |  |  |  |  |  |  |  |  |  |
Selected quarterly financial data [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net earnings |  |  |  |  |  |  |  |  | 1,580 us-gaap_NetIncomeLoss / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 2,868 us-gaap_NetIncomeLoss / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | 372 us-gaap_NetIncomeLoss / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Net earnings (Loss) per share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Common share - basic and diluted (in dollars per share) | $ 0.16 us-gaap_EarningsPerShareBasicAndDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | $ 0.12 us-gaap_EarningsPerShareBasicAndDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | $ 0.25 us-gaap_EarningsPerShareBasicAndDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | $ 0.20 us-gaap_EarningsPerShareBasicAndDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | $ 0.61 us-gaap_EarningsPerShareBasicAndDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | $ 0.62 us-gaap_EarningsPerShareBasicAndDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | $ 0.14 us-gaap_EarningsPerShareBasicAndDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | $ (0.05)us-gaap_EarningsPerShareBasicAndDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | $ 0.73 us-gaap_EarningsPerShareBasicAndDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | $ 1.32 us-gaap_EarningsPerShareBasicAndDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember | $ 0.17 us-gaap_EarningsPerShareBasicAndDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember
Class B [Member] |  |  |  |  |  |  |  |  |  |  |
Selected quarterly financial data [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net earnings |  |  |  |  |  |  |  |  | $ 7,515 us-gaap_NetIncomeLoss / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | $ 13,040 us-gaap_NetIncomeLoss / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | $ 2,001 us-gaap_NetIncomeLoss / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember
Net earnings (Loss) per share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Common share - basic and diluted (in dollars per share) | $ 0.17 us-gaap_EarningsPerShareBasicAndDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | $ 0.13 us-gaap_EarningsPerShareBasicAndDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | $ 0.27 us-gaap_EarningsPerShareBasicAndDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | $ 0.22 us-gaap_EarningsPerShareBasicAndDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | $ 0.65 us-gaap_EarningsPerShareBasicAndDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | $ 0.65 us-gaap_EarningsPerShareBasicAndDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | $ 0.15 us-gaap_EarningsPerShareBasicAndDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | $ (0.05)us-gaap_EarningsPerShareBasicAndDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | $ 0.79 us-gaap_EarningsPerShareBasicAndDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | $ 1.41 us-gaap_EarningsPerShareBasicAndDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember | $ 0.21 us-gaap_EarningsPerShareBasicAndDiluted / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember

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