Represents the closing price per share of the common stock.

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Represents the number of executive officers of the entity.

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Represents the number of stock based incentive plans operated by the entity after incorporating and superseding its previous plans.

+ References

No definition available.

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Represents the number of stock option plans superseded by the entity and replaced by another plan during the period.

+ References

No definition available.

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The intrinsic value of nonvested awards on equity-based plans excluding option plans for nonvested awards outstanding and expected to vest at the end of the period.

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No definition available.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest restricted stock units outstanding can be converted under the plan.

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No definition available.

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The weighted average fair value for nonvested restricted stock units issued during the period on other than stock (or unit) option plans.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise prices of stock awards outstanding.

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No definition available.

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The number of shares newly issued and committed to be issued during the reporting period under the plan.

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No definition available.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Percentage of vesting of share-based compensation awards.

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Intrinsic value of equity-based compensation awards vested. Excludes stock and unit options.

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No definition available.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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-Paragraph 2

-Subparagraph (c)(2)(i)-(ii)

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Net number of share options (or share units) granted during the period.

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Number of non-vested options outstanding.

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No definition available.

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Number of non-vested options forfeited.

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Weighted average grant-date fair value of non-vested options forfeited.

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Weighted average grant-date fair value of non-vested options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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As of the balance sheet date, the weighted-average exercise price (at which grantees can acquire the shares reserved for issuance) for exercisable stock options that are fully vested or expected to vest.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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Stock-Based Compensation Plans (Details) (USD $)	12 Months Ended			0 Months Ended
Stock-Based Compensation Plans (Details) (USD $)	Dec. 31, 2014 plan	Dec. 31, 2013	Dec. 31, 2012	Feb. 06, 2013	Feb. 02, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Number of stock-based incentive plans	1ssd_NumberOfStockIncentivePlans
Number of stock option plans superseded	2ssd_NumberOfStockOptionPlansSuperseded
Black-Scholes option pricing model assumptions for options granted
Number of Options Granted (in shares)	0	0
Aggregate Intrinsic Value
Total intrinsic value of stock options exercised (in dollars)	$ 800,000	$ 2,600,000	$ 1,100,000
Granted (in shares)	0	0
Unrecognized compensation cost and vesting period
Unrecognized compensation costs related to unvested stock-based compensation arrangements	14,800,000
Weighted-average period for recognition of unrecognized stock-based compensation expense	1 year 9 months
Other disclosures
Stock-based compensation expense recognized in operating expenses	12,299,000	12,053,000	10,205,000
1994 Plan
Other disclosures
Requisite service period for options to vest	4 years
Stock Bonus Plan
Other disclosures
Shares issued and committed to issue	16,000	11,000	9,000
Stock-based compensation expense recognized in operating expenses	600,000	700,000	500,000
Requisite service period for options to vest	10 years
Restricted Stock Units
Restricted stock unit activity
Outstanding at the beginning of the period (in shares)	448,000
Awarded (in shares)	343,000
Vested (in shares)	(284,000)
Forfeited (in shares)	(3,000)
Outstanding at the end of the period (in shares)	504,000	448,000
Outstanding and expected to vest at the end of the period (in shares)	492,000
Weighted-Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 32.48
Awarded (in dollars per share)	$ 30.98
Vested (in dollars per share)	$ 32.06
Forfeited (in dollars per share)	$ 31.68
Outstanding at the end of the period (in dollars per share)	$ 31.67	$ 32.48
Outstanding and expected to vest at the end of the period (in dollars per share)	$ 31.68
Aggregate Intrinsic Value
Outstanding at the end of the period (in dollars)	17,423,000	16,447,000
Outstanding and expected to vest at end of the period (in dollars)	15,582,000
Closing price per share (in dollars per share)	$ 34.60
Total intrinsic value of awards vested (in dollars)	9,100,000	5,700,000	3,100,000
Weighted-Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 32.48
Forfeited (in dollars per share)	$ 31.68
Outstanding at the end of the period (in dollars per share)	$ 31.67	$ 32.48
Aggregate Intrinsic Value
Outstanding at the end of the period (in dollars)	17,423,000	16,447,000
Outstanding and expected to vest at end of the period (in dollars)	15,582,000
Non-Qualified Stock Options
Weighted-Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 29.35
Forfeited (in dollars per share)	$ 32.92
Outstanding at the end of the period (in dollars per share)	$ 29.48	$ 29.35
Aggregate Intrinsic Value
Outstanding at the end of the period (in dollars)	4,381,000	7,404,000
Outstanding and expected to vest at end of the period (in dollars)	4,341,000
Non-Qualified Stock Options activity
Outstanding at the beginning of the period (in shares)	1,021,000
Exercised (in shares)	(161,000)
Forfeited (in shares)	(5,000)
Outstanding at the end of the period (in shares)	855,000	1,021,000
Outstanding and expected to vest at the end of the period (in shares)	847,000
Exercisable at the end of the period (in shares)	756,000
Weighted-Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 29.35
Exercised (in dollars per share)	$ 28.54
Forfeited (in dollars per share)	$ 32.92
Outstanding at the end of the period (in dollars per share)	$ 29.48	$ 29.35
Outstanding and expected to vest at end of the period (in dollars per share)	$ 29.48
Exercisable at end of the period (in dollars per share)	$ 29.45
Weighted-Average Remaining Contractual Life
Outstanding at the end of the period	3 years 1 month 6 days	4 years
Outstanding and expected to vest at end of the period	3 years 1 month 6 days
Exercisable at end of the period	3 years
Aggregate Intrinsic Value
Outstanding at the end of the period (in dollars)	4,381,000	7,404,000
Outstanding and expected to vest at end of the period (in dollars)	4,341,000
Exercisable at end of the period (in dollars)	$ 3,889,000
Closing price of share (in dollars per share)	$ 34.60
Unvested Stock Options
Number of Shares, Unvested Stock Options
Unvested at the beginning of the period (in shares)	448,000
Vested (in shares)	(348,000)
Forfeited (in shares)	(1,000)
Unvested at the end of the period (in shares)	99,000
Weighted-Average Grant-Date Fair Value, Unvested Stock Options
Unvested at the beginning of the period (in dollars per share)	$ 10.31
Vested (in dollars per share)	$ 10.31
Forfeited (in dollars per share)	$ 10.33
Unvested at the end of the period (in dollars per share)	$ 10.33
Independent directors \| Restricted Stock Units \| Restrictions lapse (awards vest) on date of award
Aggregate Intrinsic Value
Vesting rights percentage when restrictions lapse				25.00%
Independent directors \| Restricted Stock Units \| Restrictions lapse (awards vest) on first, second and third anniversaries of the date of the award
Aggregate Intrinsic Value
Vesting rights percentage when restrictions lapse				25.00%
Restrictions on awards to certain officers
Stock-Based Compensation
Number of executive officers	4
Restrictions on awards to certain officers \| Restricted Stock Units \| Restrictions lapse (awards vest) on the third anniversary of the date of the award
Aggregate Intrinsic Value
Vesting rights percentage when restrictions lapse				75.00%
Restrictions on awards to certain officers \| Restricted Stock Units \| Restrictions lapse (awards vest) on the fourth anniversary of the date of the award
Aggregate Intrinsic Value
Vesting rights percentage when restrictions lapse				25.00%
Subsequent event \| Restricted Stock Units
Restricted stock unit activity
Awarded (in shares)					339,047
Subsequent event \| Independent directors \| Restricted Stock Units
Restricted stock unit activity
Awarded (in shares)					8,550
Weighted-Average Exercise Price
Awarded (in dollars per share)					32.64