Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity - Restricted Stock (Details)

v2.4.1.9
Shareholders' Equity - Restricted Stock (Details) (Restricted shares, 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 1,143,581us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
Vesting Period 4 years
January 20, 2015
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Grant Date Jan. 20, 2015 [1]
Expire Date Jan. 20, 2019
Shares 1,115,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ lts_RestrictedStockGrantedPeriodAxis
= lts_PeriodOneRSMember
Fair Value 4,404us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ lts_RestrictedStockGrantedPeriodAxis
= lts_PeriodOneRSMember 		[2]
February 3, 2015
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Grant Date Feb. 03, 2015 [3],[4]
Expire Date Oct. 27, 2018
Shares 28,581us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ lts_RestrictedStockGrantedPeriodAxis
= lts_PeriodTwoRSMember
Fair Value 111us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ lts_RestrictedStockGrantedPeriodAxis
= lts_PeriodTwoRSMember 		[2]
[1] Restricted stock vests in four equal annual installments beginning on the first anniversary of the grant date.
[2] Fair value is calculated using the closing price on date of grant.
[3] Restricted stock vests in four equal annual installments beginning on October 27, 2015 and each anniversary thereafter.
[4] Compensation expense recognized each period is based on the awards estimated value at the most recent reporting date.