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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

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Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	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 segment	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Information
Number of reportable segments									3us-gaap_NumberOfReportableSegments
Net sales	$ 166,630us-gaap_SalesRevenueNet	$ 209,320us-gaap_SalesRevenueNet	$ 207,893us-gaap_SalesRevenueNet	$ 168,305us-gaap_SalesRevenueNet	$ 160,074us-gaap_SalesRevenueNet	$ 195,619us-gaap_SalesRevenueNet	$ 195,348us-gaap_SalesRevenueNet	$ 154,281us-gaap_SalesRevenueNet	$ 752,148us-gaap_SalesRevenueNet	$ 705,322us-gaap_SalesRevenueNet	$ 656,231us-gaap_SalesRevenueNet
Income from operations	15,320us-gaap_OperatingIncomeLoss	32,218us-gaap_OperatingIncomeLoss	32,133us-gaap_OperatingIncomeLoss	19,605us-gaap_OperatingIncomeLoss	11,902us-gaap_OperatingIncomeLoss	30,885us-gaap_OperatingIncomeLoss	29,678us-gaap_OperatingIncomeLoss	9,013us-gaap_OperatingIncomeLoss	99,276us-gaap_OperatingIncomeLoss	81,478us-gaap_OperatingIncomeLoss	61,709us-gaap_OperatingIncomeLoss
Depreciation and amortization									27,918	27,518	26,857
Impairment of goodwill	38us-gaap_GoodwillImpairmentLoss	492us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss	530us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss	2,346us-gaap_GoodwillImpairmentLoss
Impairment of long-lived asset									0	1,025	803
Significant non-cash charges									13,190ssd_SignificantNoncashCharges	12,747ssd_SignificantNoncashCharges	10,667ssd_SignificantNoncashCharges
Provision for (benefit from) income taxes	4,942us-gaap_IncomeTaxExpenseBenefit	11,577us-gaap_IncomeTaxExpenseBenefit	11,667us-gaap_IncomeTaxExpenseBenefit	7,605us-gaap_IncomeTaxExpenseBenefit	4,290us-gaap_IncomeTaxExpenseBenefit	10,870us-gaap_IncomeTaxExpenseBenefit	11,177us-gaap_IncomeTaxExpenseBenefit	4,256us-gaap_IncomeTaxExpenseBenefit	35,791us-gaap_IncomeTaxExpenseBenefit	30,593us-gaap_IncomeTaxExpenseBenefit	20,003us-gaap_IncomeTaxExpenseBenefit
Capital expenditures and asset acquisitions, net of cash acquired									23,935	23,297	87,086
Total assets	973,065us-gaap_Assets				956,525us-gaap_Assets				973,065us-gaap_Assets	956,525us-gaap_Assets	890,322us-gaap_Assets
Cash and short-term investments	260,307				251,208				260,307	251,208	175,553	213,817
Administrative and all other
Segment Information
Lease term of entity's facilities in Vacaville									10 years
Net sales									0	0	0
Income from operations									949	(2,463)	1,017
Depreciation and amortization									1,480	1,293	1,466
Impairment of goodwill									0
Significant non-cash charges									2,101	2,177	2,051
Provision for (benefit from) income taxes									2,185	1,416	1,099
Capital expenditures and asset acquisitions, net of cash acquired									0	9
Total assets	83,664				96,385				83,664	96,385	82,366
Cash and short-term investments	167,400				156,000				167,400	156,000	91,900
Intersegment elimination
Segment Information
Net sales									23,237	21,421	21,272
North America
Segment Information
Net sales									613,843	572,789	522,895
Income from operations									94,888	84,885	71,586
Depreciation and amortization									18,129	17,707	16,317
Impairment of goodwill									0
Impairment of long-lived asset											461
Significant non-cash charges									9,722	8,867	7,369
Provision for (benefit from) income taxes									30,287	26,372	15,037
Capital expenditures and asset acquisitions, net of cash acquired									20,160	19,424	23,014
Total assets	679,844				627,196				679,844	627,196	583,501
North America \| Intersegment elimination
Segment Information
Net sales									4,134	4,735	5,121
Europe
Segment Information
Net sales									123,177	117,740	122,493
Income from operations									5,005	1,258	(8,095)
Depreciation and amortization									6,755	7,019	7,744
Impairment of goodwill									530		2,346
Impairment of long-lived asset										1,025	342
Significant non-cash charges									1,164	1,561	1,053
Provision for (benefit from) income taxes									2,437	2,906	3,544
Capital expenditures and asset acquisitions, net of cash acquired									2,977	2,244	63,156
Total assets	180,005				201,384				180,005	201,384	194,000
Europe \| Intersegment elimination
Segment Information
Net sales									1,170	352	430
Asia/Pacific
Segment Information
Net sales									15,128	14,793	10,843
Income from operations									(1,566)	(2,202)	(2,799)
Depreciation and amortization									1,554	1,499	1,330
Impairment of goodwill									0
Significant non-cash charges									203	142	194
Provision for (benefit from) income taxes									882	(101)	323
Capital expenditures and asset acquisitions, net of cash acquired									798	1,620	916
Total assets	29,552				31,560				29,552	31,560	30,455
Asia/Pacific \| Intersegment elimination
Segment Information
Net sales									17,933	16,334	15,721
Foreign operating entities
Segment Information
Cash and short-term investments	$ 94,900								$ 94,900
Percentage of cash and cash equivalents	36.50%								36.50%