Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity - Capital Stock (Details)

v2.4.1.9
Shareholders' Equity - Capital Stock (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 1 Months Ended
Mar. 31, 2015
May 02, 2015
Dec. 31, 2014
Class of Stock [Line Items]      
Preferred stock, par value (usd per share) $ 0.0001us-gaap_PreferredStockParOrStatedValuePerShare   $ 0.0001us-gaap_PreferredStockParOrStatedValuePerShare
Common stock, shares authorized 800,000,000us-gaap_CommonStockSharesAuthorized   800,000,000us-gaap_CommonStockSharesAuthorized
Series A Preferred Stock      
Class of Stock [Line Items]      
Preferred stock, par value (usd per share) $ 0.0001us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
  $ 0.0001us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
At the market shares sold 2,952,939lts_AttheMarketStockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
   
Proceeds from Issuance of public offering $ 70,923us-gaap_ProceedsFromIssuanceInitialPublicOffering
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
   
Offering expenses 1,447us-gaap_PaymentsOfStockIssuanceCosts
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
   
Dividends paid 6,332us-gaap_PaymentsOfDividends
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
   
Dividends paid per share on monthly basis $ 0.1667lts_PreferredStockDividendsPerShareCashPaidonMonthlyBasis
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
   
Series A Preferred Stock | Subsequent Event      
Class of Stock [Line Items]      
At the market shares sold   224,036lts_AttheMarketStockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Offering expenses   108us-gaap_PaymentsOfStockIssuanceCosts
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
 
Proceeds from at market preferred stock   $ 5,378lts_ProceedsfromAtMarketPreferredStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember