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Foreign Operations and Sales (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
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
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total Gross sales $ 128,841us-gaap_SalesRevenueGoodsGross [1] $ 81,145us-gaap_SalesRevenueGoodsGross [2] $ 97,972us-gaap_SalesRevenueGoodsGross [3] $ 66,192us-gaap_SalesRevenueGoodsGross [4] $ 103,011us-gaap_SalesRevenueGoodsGross $ 77,992us-gaap_SalesRevenueGoodsGross $ 61,628us-gaap_SalesRevenueGoodsGross $ 74,581us-gaap_SalesRevenueGoodsGross [5] $ 374,150us-gaap_SalesRevenueGoodsGross $ 317,212us-gaap_SalesRevenueGoodsGross $ 277,931us-gaap_SalesRevenueGoodsGross
Long-Lived Assets 216,381us-gaap_NoncurrentAssets       214,647us-gaap_NoncurrentAssets       216,381us-gaap_NoncurrentAssets 214,647us-gaap_NoncurrentAssets 193,218us-gaap_NoncurrentAssets
Export sales, included in domestic gross sales                 101,101cbm_ExportSalesIncludedInDomesticGrossSales 86,850cbm_ExportSalesIncludedInDomesticGrossSales 32,872cbm_ExportSalesIncludedInDomesticGrossSales
Major customer (in hundredths)                 24.00%us-gaap_ConcentrationRiskPercentage1 18.30%us-gaap_ConcentrationRiskPercentage1 12.50%us-gaap_ConcentrationRiskPercentage1
Domestic [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total Gross sales                 186,735us-gaap_SalesRevenueGoodsGross
/ us-gaap_StatementGeographicalAxis
= cbm_DomesticMember		 153,202us-gaap_SalesRevenueGoodsGross
/ us-gaap_StatementGeographicalAxis
= cbm_DomesticMember		 109,729us-gaap_SalesRevenueGoodsGross
/ us-gaap_StatementGeographicalAxis
= cbm_DomesticMember
Long-Lived Assets 64,995us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= cbm_DomesticMember		       59,496us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= cbm_DomesticMember		       64,995us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= cbm_DomesticMember		 59,496us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= cbm_DomesticMember		 44,085us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= cbm_DomesticMember
Foreign [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total Gross sales                 187,415us-gaap_SalesRevenueGoodsGross
/ us-gaap_StatementGeographicalAxis
= cbm_ForeignMember		 164,010us-gaap_SalesRevenueGoodsGross
/ us-gaap_StatementGeographicalAxis
= cbm_ForeignMember		 168,202us-gaap_SalesRevenueGoodsGross
/ us-gaap_StatementGeographicalAxis
= cbm_ForeignMember
Long-Lived Assets 151,386us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= cbm_ForeignMember		       155,151us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= cbm_ForeignMember		       151,386us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= cbm_ForeignMember		 155,151us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= cbm_ForeignMember		 149,133us-gaap_NoncurrentAssets
/ us-gaap_StatementGeographicalAxis
= cbm_ForeignMember
Europe [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total Gross sales                 232,894us-gaap_SalesRevenueGoodsGross
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember		 210,463us-gaap_SalesRevenueGoodsGross
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember		 150,678us-gaap_SalesRevenueGoodsGross
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember
North America [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total Gross sales                 117,477us-gaap_SalesRevenueGoodsGross
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember		 86,974us-gaap_SalesRevenueGoodsGross
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember		 105,439us-gaap_SalesRevenueGoodsGross
/ us-gaap_StatementGeographicalAxis
= us-gaap_NorthAmericaMember
Asia [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total Gross sales                 12,865us-gaap_SalesRevenueGoodsGross
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaMember		 13,800us-gaap_SalesRevenueGoodsGross
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaMember		 12,827us-gaap_SalesRevenueGoodsGross
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaMember
Other [Member]                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Total Gross sales                 $ 10,914us-gaap_SalesRevenueGoodsGross
/ us-gaap_StatementGeographicalAxis
= cbm_OtherGeographicAreaMember		 $ 5,975us-gaap_SalesRevenueGoodsGross
/ us-gaap_StatementGeographicalAxis
= cbm_OtherGeographicAreaMember		 $ 8,987us-gaap_SalesRevenueGoodsGross
/ us-gaap_StatementGeographicalAxis
= cbm_OtherGeographicAreaMember
[1] Income from continuing operations includes a gain on sale of land of $1,234 and a corresponding tax expense of $387, a benefit of $11,719 for the reversal of a valuation allowance on deferred tax assets, a benefit of $3,948 for favorable audit settlements, and expense of $7,170 related to a voluntary lump sum pension settlement.
[2] Income from continuing operations includes the reversal of a valuation allowance on deferred tax assets of $824.
[3] Income from continuing operations includes the reversal of a valuation allowance on deferred tax assets of $14,161 and a loss of $4,122 related to the purchase of the remaining shares in Zenara.
[4] Income from continuing operations includes the reversal of a valuation allowance on deferred tax assets of $198.
[5] Income from continuing operations includes a gain on sale of an office building of $4,680 and a corresponding tax expense of $1,470 and a benefit of $1,155 due to changes in tax laws.