Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Jun. 30, 2012	Dec. 31, 2012 Capital expenditures for machinery and equipment	Dec. 31, 2011 Capital expenditures for machinery and equipment	Dec. 31, 2012 Standby letters of credit Secured by restricted cash	Dec. 31, 2011 Standby letters of credit Secured by restricted cash	Dec. 31, 2012 Standby letters of credit Secured by Credit Agreement	Dec. 31, 2012 Standby letters of credit Established by a sales agent on behalf of Colt	Dec. 31, 2011 Standby letters of credit Established by a sales agent on behalf of Colt	Dec. 31, 2012 Industrial Cooperation Agreements	Dec. 31, 2011 Industrial Cooperation Agreements
Commitments and contingencies
Standby letters of credit						$ 1,253	$ 1,660	$ 1,715	$ 702	$ 804
Unconditional purchase obligations				2,357	2,102
Remaining gross offset purchase commitments											68,180	58,466
Remaining net offset purchase commitments, accrual amount											1,804	1,563
Settlement amount of dispute			625
Accrued expenses related to potential audit settlements		695	650
Interest expense related to potential audit settlements		305	320
Settlement amount with taxing authority	$ 1,000