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v2.4.1.9

Debt (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Debt |  |  |
Credit facility, maximum borrowing capacity | $ 304,300,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity |  |
Amount of interest costs incurred, capitalized, and expensed |  |  |
Interest costs incurred | 953,000 us-gaap_InterestCostsIncurred | 1,019,000 us-gaap_InterestCostsIncurred | 909,000 us-gaap_InterestCostsIncurred
Less: Interest capitalized | (98,000)us-gaap_InterestCostsCapitalized | (118,000)us-gaap_InterestCostsCapitalized | (116,000)us-gaap_InterestCostsCapitalized
Interest expense | 855,000 us-gaap_InterestExpense | 901,000 us-gaap_InterestExpense | 793,000 us-gaap_InterestExpense
Primary revolving line of credit |  |  |
Debt |  |  |
Credit facility, maximum borrowing capacity | 300,000,000.0 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember |  |
Primary revolving line of credit | Minimum |  |  |
Debt |  |  |
Credit facility, interest rate spread (as a percent) | 0.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Facility fees on the available commitment of the facility (as a percent) | 0.15%us-gaap_LineOfCreditFacilityCommitmentFeePercentage / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |
Primary revolving line of credit | Maximum |  |  |
Debt |  |  |
Credit facility, interest rate spread (as a percent) | 0.45%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Facility fees on the available commitment of the facility (as a percent) | 0.30%us-gaap_LineOfCreditFacilityCommitmentFeePercentage / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Primary revolving line of credit | LIBOR |  |  |
Debt |  |  |
LIBOR Rate at end of period (as a percent) | 0.16%ssd_DebtInstrumentVariableRateBaseRateAtPeriodEnd / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember / us-gaap_VariableRateAxis = ssd_DebtInstrumentVariableRateLIBORMember |  |
Credit facility, interest rate basis | LIBOR |  |
Primary revolving line of credit | LIBOR | Minimum |  |  |
Debt |  |  |
Credit facility, interest rate spread (as a percent) | 0.60%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_VariableRateAxis = ssd_DebtInstrumentVariableRateLIBORMember |  |
Primary revolving line of credit | LIBOR | Maximum |  |  |
Debt |  |  |
Credit facility, interest rate spread (as a percent) | 1.45%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = us-gaap_LineOfCreditMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_VariableRateAxis = ssd_DebtInstrumentVariableRateLIBORMember |  |
Primary revolving line of credit | Base rate |  |  |
Debt |  |  |
Credit facility, interest rate basis | base rate |  |
Other revolving credit lines and long term debt |  |  |
Debt |  |  |
Total borrowing capacity | 4,300,000 ssd_TotalBorrowingCapacity / us-gaap_DebtInstrumentAxis = ssd_OtherLinesOfCreditAndLongTermDebtMember |  |
Credit facility, interest rate low end of range (as a percent) | 0.88%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum / us-gaap_DebtInstrumentAxis = ssd_OtherLinesOfCreditAndLongTermDebtMember |  |
Credit facility, interest rate high end of range (as a percent) | 7.25%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum / us-gaap_DebtInstrumentAxis = ssd_OtherLinesOfCreditAndLongTermDebtMember |  |
Total outstanding balances | $ 0 ssd_OtherAmountOutstanding / us-gaap_DebtInstrumentAxis = ssd_OtherLinesOfCreditAndLongTermDebtMember | $ 100,000 ssd_OtherAmountOutstanding / us-gaap_DebtInstrumentAxis = ssd_OtherLinesOfCreditAndLongTermDebtMember |

X
- Definition The reference rate of the variable rate debt instrument at the end of the reporting period. + References No definition available. + Details
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Namespace Prefix: | ssd_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount outstanding as of the balance sheet date. + References No definition available. + Details
Name: | ssd_OtherAmountOutstanding
Namespace Prefix: | ssd_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The total amount of borrowing capacity as of the balance sheet date. + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
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- Definition Maximum contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Minimum contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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X
- Definition Amount of interest capitalized during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Allowance for Funds Used during Construction -URI http://asc.fasb.org/extlink&oid=6504829 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
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Balance Type: | debit
Period Type: | duration

X
- Definition Total interest costs incurred during the period and either capitalized or charged against earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 + Details
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- Details
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- Definition Amount of the cost of borrowed funds accounted for as interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 9 -Article 9 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | credit
Period Type: | instant

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