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Stockholders' Equity - Share Repurchase Program (Details)	Dec. 31, 2016 shares
Share Repurchase Program
Number of repurchased shares authorized	5,500,000
Number of available shares may be repurchased	955,121

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- References

No definition available.

+ Details

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Namespace Prefix:	osis_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

+ Details

Name:	us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

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- Definition

The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

+ Details

Name:	us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant