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Accrued Expenses and Other Current Liabilities - Narrative (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Compensation and benefits    
Accrued Expenses and Other Current Liabilities [Line Items]    
Restructuring Reserve, Current $ 0.3us-gaap_RestructuringReserveCurrent
/ frm_AccruedExpensesandOtherCurrentLiabilitiesComponentAxis
= frm_CompensationandbenefitsMember
$ 0.3us-gaap_RestructuringReserveCurrent
/ frm_AccruedExpensesandOtherCurrentLiabilitiesComponentAxis
= frm_CompensationandbenefitsMember
Other accrued expenses and current liabilities    
Accrued Expenses and Other Current Liabilities [Line Items]    
Restructuring Reserve, Current $ 0us-gaap_RestructuringReserveCurrent
/ frm_AccruedExpensesandOtherCurrentLiabilitiesComponentAxis
= frm_OtheraccruedexpensesandcurrentliabilitiesMember
$ 0.1us-gaap_RestructuringReserveCurrent
/ frm_AccruedExpensesandOtherCurrentLiabilitiesComponentAxis
= frm_OtheraccruedexpensesandcurrentliabilitiesMember