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Basis of Presentation and Significant Accounting Policies Allowance for obsolete inventory (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Accounting Policies [Abstract]        
Inventory Valuation Reserves $ 15,181us-gaap_InventoryValuationReserves $ 7,329us-gaap_InventoryValuationReserves $ 7,835us-gaap_InventoryValuationReserves $ 7,000us-gaap_InventoryValuationReserves
Provision for obsolete inventory 9,979cas_Provisionforobsoleteinventory 2,259cas_Provisionforobsoleteinventory 1,153cas_Provisionforobsoleteinventory  
Inventory allowance, write-offs $ (2,127)cas_Inventoryallowancewriteoffs $ (2,765)cas_Inventoryallowancewriteoffs $ (318)cas_Inventoryallowancewriteoffs