XML 64 R49.htm IDEA: XBRL DOCUMENT v3.6.0.2

Stock-Based Compensation Plans (Tables)

12 Months Ended

Dec. 31, 2016

Stock Options Plan [Member]

Assumptions Used to Determine Grant-Date Fair Value of Options

The following weighted average assumptions were used to determine the grant-date fair value of options:

		2016				2015				2014
Dividend yield			1.38	%			1.03	%			1.34	%
Expected life			5 years				5 years				5 years
Volatility			25.11	%			25.5	%			30.7	%
Risk free interest rate			0.91	%			1.05	%			0.97	%

Summary of Transactions of Company's Stock Option Plans

The following table summarizes the transactions of the Company’s stock option plans for the year ended December 31, 2016:

		Number of Options				Weighted Average Exercise Price				Weighted Average Grant-Date Fair Value
Outstanding at December 31, 2015			667,439			$	19.87			$	20.19
Granted – at discount			67,546			$	0.00			$	38.13
– at market value			24,794			$	44.34			$	9.17
Exercised			(151,164	)		$	14.38			$	19.63
Forfeited			(37,621	)		$	14.49			$	24.83
Outstanding at December 31, 2016			570,994			$	20.38			$	21.68

Stock Equivalent Units [Member]

Assumptions Used to Determine Fair Value of SEUs

The following assumptions were used to determine the fair value of SEUs at the balance sheet dates:

		2016				2015				2014
Dividend yield			0.98	%			1.12	%			1.29	%
Volatility			25.2	%			24.6	%			26.0	%
Risk free interest rate			1.47	%			1.31	%			1.10	%

Summarizes Transactions of SEUs

The following table summarizes the transactions of the Company’s SEUs for the year ended December 31, 2016:

		Number of SEUs				Weighted Average Exercise Price				Weighted Average Grant-Date Fair Value
Outstanding at December 31, 2015			279,750			$	3.79			$	31.72
Granted – at discount			70,153			$	0.00			$	36.05
– at market value			7,316			$	44.18			$	9.11
Exercised			(66,424	)		$	4.32			$	27.28
Forfeited			(10,980	)		$	3.61			$	31.66
Outstanding at December 31, 2016			279,815			$	3.77			$	33.40

X

- Definition

Schedule of share based payment award valuation assumptions.

+ References

No definition available.

+ Details

Name:	iosp_ScheduleOfShareBasedPaymentAwardValuationAssumptionsTableTextBlock
Namespace Prefix:	iosp_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of share-based compensation plans that may be presented in a single table for outstanding, vested and expected to vest, and exercisable awards. The information that may be disclosed in this table may include, but is not limited to, number of shares, weighted average exercise price, weighted average remaining contractual life, and aggregate intrinsic value.

+ References

No definition available.

+ Details

Name:	us-gaap_ScheduleOfShareBasedCompensationActivityTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

Name:	us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AwardTypeAxis=iosp_StockEquivalentUnitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: