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v2.4.1.9

- Shares and EPS (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 series | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 1999 rightpershare
Common Stock |  |  |  |  |  |  |  |  |  |  |  |
Number of votes for each share of common stock held |  |  |  |  |  |  |  |  | 1 ssd_CommonStockVotingRightsNumber |  |  |
Number of rights per common stock as a part of dividend distribution |  |  |  |  |  |  |  |  |  |  |  | 1 ssd_PreferredStockStockRightDividendDeclared
Percentage acquisition of common stock triggering exercise terms of rights, minimum |  |  |  |  |  |  |  |  | 15.00%ssd_PreferredStockDividendRightsExercisablePercentageOfCommonStockAcquiredMinimum |  |  |
Ownership interest held by any stockholder at date of rights distribution to which additional exercise terms for the Rights distributed apply (as a percent) |  |  |  |  |  |  |  |  | 25.00%ssd_PreferredStockDividendRightsCommonStockOwnershipInterestHeldAtDateOfRightsDistribution |  |  |
Subsequent increase in ownership interest held by any stockholder after rights distribution to which additional exercise terms for the Rights distributed apply (as a percent) |  |  |  |  |  |  |  |  | 40.00%ssd_PreferredStockDividendRightsCommonStockAdditionalOwnershipInterestAcquiredSubsequentToDistributionOfRightsMinimum |  |  |
Redemption price per right (in cents per right) |  |  |  |  |  |  |  |  | $ 0.01 ssd_RightRedemptionPrice |  |  |
Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |
Number of series by which the Board may issue authorized and unissued preferred stock, minimum |  |  |  |  |  |  |  |  | 1 ssd_PreferredStockBoardAuthorizedToIssueInSeriesMinimumNumber |  |  |
Reconciliation of basic earnings per share ("EPS") to diluted EPS |  |  |  |  |  |  |  |  |  |  |  |
Net income available to common stockholders | $ 10,380 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 20,614 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 20,451 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 12,086 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 7,668 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 20,006 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 18,502 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 4,795 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 63,531 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 50,971 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 41,918 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |
Basic weighted-average shares outstanding |  |  |  |  |  |  |  |  | 48,977 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 48,521 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 48,339 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |
Dilutive effect of potential common stock equivalents - stock options (in shares) |  |  |  |  |  |  |  |  | 217 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 152 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements | 73 us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements |
Diluted weighted-average shares outstanding |  |  |  |  |  |  |  |  | 49,194 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 48,673 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 48,412 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |
Net earnings per share: |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) | $ 0.21 us-gaap_EarningsPerShareBasic | $ 0.42 us-gaap_EarningsPerShareBasic | $ 0.42 us-gaap_EarningsPerShareBasic | $ 0.25 us-gaap_EarningsPerShareBasic | $ 0.16 us-gaap_EarningsPerShareBasic | $ 0.41 us-gaap_EarningsPerShareBasic | $ 0.38 us-gaap_EarningsPerShareBasic | $ 0.10 us-gaap_EarningsPerShareBasic | $ 1.30 us-gaap_EarningsPerShareBasic | $ 1.05 us-gaap_EarningsPerShareBasic | $ 0.87 us-gaap_EarningsPerShareBasic |
Diluted (in dollars per share) | $ 0.21 us-gaap_EarningsPerShareDiluted | $ 0.42 us-gaap_EarningsPerShareDiluted | $ 0.42 us-gaap_EarningsPerShareDiluted | $ 0.25 us-gaap_EarningsPerShareDiluted | $ 0.16 us-gaap_EarningsPerShareDiluted | $ 0.41 us-gaap_EarningsPerShareDiluted | $ 0.38 us-gaap_EarningsPerShareDiluted | $ 0.10 us-gaap_EarningsPerShareDiluted | $ 1.29 us-gaap_EarningsPerShareDiluted | $ 1.05 us-gaap_EarningsPerShareDiluted | $ 0.87 us-gaap_EarningsPerShareDiluted |
Potentially dilutive securities excluded from earnings per diluted share because their effect is anti-dilutive (in shares) |  |  |  |  |  |  |  |  | 0 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 0 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 1,700 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount |

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