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Treasury Stock: (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Treasury stock purchase plan [Abstract]  
Treasury Stock Purchase Plan $ 40.0icui_TreasuryStockPurchasePlan
Treasury Stock Purchase Plan Remaining Available 22.5icui_TreasuryStockPurchasePlanRemainingAvailable
Shares Paid for Tax Withholding for Share Based Compensation 16,401us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
Payments Related to Tax Withholding for Share-based Compensation $ 1.4us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation