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Subsequent Event (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Jan. 11, 2015
Dec. 31, 2014
Credit agreement capacity $ 65.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity $ 25.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity  
Funded Debt to EBITDA covenant 2.5flxs_FundedDebtToEbitdaCovenant    
Letters Of Credit [Member]      
Credit agreement capacity 4.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember		    
Unsecured [Member]      
Credit agreement capacity $ 10.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_UnsecuredDebtMember		   $ 8.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_UnsecuredDebtMember