Annual report pursuant to Section 13 and 15(d)

Notes Payable (Securities America Notes) (Details)

v2.4.1.9
Notes Payable (Securities America Notes) (Details) (USD $)
12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Nov. 04, 2011
Feb. 15, 2015
Debt Instrument [Line Items]          
Interest paid $ 5,920,000us-gaap_InterestPaid $ 16,034,000us-gaap_InterestPaid $ 22,968,000us-gaap_InterestPaid    
Loss on extinguishment of debt 548,000us-gaap_GainsLossesOnExtinguishmentOfDebt 4,547,000us-gaap_GainsLossesOnExtinguishmentOfDebt 0us-gaap_GainsLossesOnExtinguishmentOfDebt    
Frost Nevada          
Debt Instrument [Line Items]          
Loans payable 25,076,000us-gaap_LoansPayable
/ us-gaap_LineOfCreditFacilityAxis
= lts_FrostNevadaMember
       
Interest paid 4,334,000us-gaap_InterestPaid
/ us-gaap_LineOfCreditFacilityAxis
= lts_FrostNevadaMember
13,546,000us-gaap_InterestPaid
/ us-gaap_LineOfCreditFacilityAxis
= lts_FrostNevadaMember
16,366,000us-gaap_InterestPaid
/ us-gaap_LineOfCreditFacilityAxis
= lts_FrostNevadaMember
   
Vector Group          
Debt Instrument [Line Items]          
Loans payable 2,786,000us-gaap_LoansPayable
/ us-gaap_LineOfCreditFacilityAxis
= lts_VectorGroupMember
       
Interest paid 482,000us-gaap_InterestPaid
/ us-gaap_LineOfCreditFacilityAxis
= lts_VectorGroupMember
1,323,000us-gaap_InterestPaid
/ us-gaap_LineOfCreditFacilityAxis
= lts_VectorGroupMember
1,499,000us-gaap_InterestPaid
/ us-gaap_LineOfCreditFacilityAxis
= lts_VectorGroupMember
   
Company's president and chief executive officer          
Debt Instrument [Line Items]          
Loans payable 10,000us-gaap_LoansPayable
/ us-gaap_LineOfCreditFacilityAxis
= lts_CompanyspresidentandchiefexecutiveofficerMember
       
Interest paid 6,000us-gaap_InterestPaid
/ us-gaap_LineOfCreditFacilityAxis
= lts_CompanyspresidentandchiefexecutiveofficerMember
15,000us-gaap_InterestPaid
/ us-gaap_LineOfCreditFacilityAxis
= lts_CompanyspresidentandchiefexecutiveofficerMember
19,000us-gaap_InterestPaid
/ us-gaap_LineOfCreditFacilityAxis
= lts_CompanyspresidentandchiefexecutiveofficerMember
   
November 2011 Loan          
Debt Instrument [Line Items]          
Current borrowing capacity 160,700,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= lts_November2011LoanMember
    160,700,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= lts_November2011LoanMember
 
Frequency of periodic payment       quarterly  
Stated percentage       11.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= lts_November2011LoanMember
 
Funding fees       804,000lts_FundingFees
/ us-gaap_DebtInstrumentAxis
= lts_November2011LoanMember
 
Extinguishment of debt 20,022,000us-gaap_ExtinguishmentOfDebtAmount
/ us-gaap_DebtInstrumentAxis
= lts_November2011LoanMember
110,850,000us-gaap_ExtinguishmentOfDebtAmount
/ us-gaap_DebtInstrumentAxis
= lts_November2011LoanMember
     
Loss on extinguishment of debt 548,000us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_DebtInstrumentAxis
= lts_November2011LoanMember
4,547,000us-gaap_GainsLossesOnExtinguishmentOfDebt
/ us-gaap_DebtInstrumentAxis
= lts_November2011LoanMember
     
November 2011 Loan | Subsequent event          
Debt Instrument [Line Items]          
Principal payment         11,852,000us-gaap_DebtInstrumentPeriodicPaymentPrincipal
/ us-gaap_DebtInstrumentAxis
= lts_November2011LoanMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Securities America Notes          
Debt Instrument [Line Items]          
Warrants outstanding       10,713,332us-gaap_WarrantsAndRightsOutstanding
/ us-gaap_DebtInstrumentAxis
= lts_SecuritiesAmericaNotesMember
 
Exercise price       1.68us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights
/ us-gaap_DebtInstrumentAxis
= lts_SecuritiesAmericaNotesMember
 
Warrants issued to lenders       $ 9,428,000us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued
/ us-gaap_DebtInstrumentAxis
= lts_SecuritiesAmericaNotesMember