Significant Accounting Policies (Details) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Reconciliation of weighted-average shares used in computing basic and diluted net income per share
Shares used in computing basic net income per share	56,537	58,303	56,463	58,287
Dilutive effect of stock options and restricted stock units	911	704	868	734
Shares used in computing diluted net income per share	57,448	59,007	57,331	59,021