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Retirement and Security Bonus Plans Retirement and Security Bonus Plans (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Compensation and Retirement Disclosure [Abstract] |  |  |
401k Employer matching contributions | $ 2.9 us-gaap_DefinedContributionPlanCostRecognized | $ 2.7 us-gaap_DefinedContributionPlanCostRecognized | $ 1.7 us-gaap_DefinedContributionPlanCostRecognized
Employer contributions, profit sharing retirement plan | 0.6 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount | 0.1 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount | 0.5 us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |
Cash Surrender Value, Fair Value Disclosure | 1.1 us-gaap_CashSurrenderValueFairValueDisclosure |  |
Security bonus plan |  |  |
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items] |  |  |
Initial vesting percentage | 25.00%laws_DeferredCompensationVestingPercentageInitial / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = us-gaap_DeferredProfitSharingMember |  |
Minimum vesting period | 5 years |  |
Annual vesting percentage after initial period | 5.00%laws_DeferredCompensationAnnualVestingPercentageAfterFiveYears / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = us-gaap_DeferredProfitSharingMember |  |
Expense recognized | $ 0.6 us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = us-gaap_DeferredProfitSharingMember | $ 0.7 us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = us-gaap_DeferredProfitSharingMember | $ 2.1 us-gaap_DeferredCompensationArrangementWithIndividualCompensationExpense / us-gaap_DeferredCompensationArrangementWithIndividualExcludingShareBasedPaymentsAndPostretirementBenefitsByTypeOfDeferredCompensationAxis = us-gaap_DeferredProfitSharingMember

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- Definition Deferred Compensation Annual Vesting Percentage After Five Years + References No definition available. + Details
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- Definition Deferred Compensation Minimum Vesting Period + References No definition available. + Details
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- Definition Deferred Compensation Vesting Percentage Initial + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Fair value portion of the amount that could be realized under a life insurance contract or contracts owned by the entity, commonly known as corporate-owned life insurance (COLI) or bank-owned life insurance (BOLI). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Surrender Value -URI http://asc.fasb.org/extlink&oid=6507153 + Details
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- Details
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- Definition The compensation expense recognized during the period pertaining to the deferred compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -SubTopic 10 -Section 30 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20015-108363 + Details
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- Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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- Details
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