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Significant Accounting Policies (Details)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Reconciliation of weighted-average shares used in computing basic and diluted net income per share    
Shares used in computing basic net income per share 56,617us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 56,388us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive effect of stock options and restricted stock units 1,665us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 820us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Shares used in computing diluted net income per share 58,282us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 57,208us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding