Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity - Options Granted (Details)

v2.4.1.9
Shareholders' Equity - Options Granted (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Shares 1,380,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
January 17, 2014  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Grant Date Jan. 02, 2015 [1]
Expire Date Jan. 02, 2025
Shares 500,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ lts_StockOptionsGrantedPeriodAxis
= lts_PeriodOneMember
Exercise Price 3.88us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ lts_StockOptionsGrantedPeriodAxis
= lts_PeriodOneMember
Fair Value 1,163us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ lts_StockOptionsGrantedPeriodAxis
= lts_PeriodOneMember 		[2]
January 17, 2014  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Grant Date Jan. 20, 2015 [1]
Expire Date Jan. 20, 2025
Shares 850,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ lts_StockOptionsGrantedPeriodAxis
= lts_PeriodTwoMember
Exercise Price 4.25us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ lts_StockOptionsGrantedPeriodAxis
= lts_PeriodTwoMember
Fair Value 2,550us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ lts_StockOptionsGrantedPeriodAxis
= lts_PeriodTwoMember 		[2]
January 22, 2014  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Grant Date Jan. 20, 2015 [1],[3]
Expire Date Jan. 20, 2025
Shares 30,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ lts_StockOptionsGrantedPeriodAxis
= lts_PeriodThreeMember
Exercise Price 4.25us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
/ lts_StockOptionsGrantedPeriodAxis
= lts_PeriodThreeMember
Fair Value 90us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
/ lts_StockOptionsGrantedPeriodAxis
= lts_PeriodThreeMember 		[2]
[1] Options vest in four equal annual installments beginning on the first anniversary of the respective grant dates.
[2] Fair value is calculated using the Black-Scholes option pricing model.
[3] Compensation expense recognized each period is based on the award's estimated value at the most recent reporting date.