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Stockholders' Equity (Details 2) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended 12 Months Ended 88 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Jun. 30, 2014
Mar. 29, 2007
Reconciliation of the number of shares outstanding with the number of shares used in computing basic and diluted earnings per share              
Common shares outstanding, end of period 37,748,000 37,257,000 37,748,000 37,257,000      
Effect of using weighted average common shares outstanding (42,000) (67,000) (104,000) (129,000)      
Shares used in computing earnings per share - basic 37,706,000 37,190,000 37,644,000 37,128,000      
Effect of shares issuable under stock option plans based on the treasury stock method 144,000 121,000 165,000 107,000      
Effect of contingently issuable restricted shares 30,000 54,000 105,000 114,000      
Shares used in computing earnings per share - diluted 37,880,000 37,365,000 37,914,000 37,349,000      
Number of shares of unvested contingently issuable restricted stock outstanding   100,000   100,000      
Share Repurchase Program              
Number of shares of outstanding common stock authorized to be acquired under a stock repurchase program 6,600,000   6,600,000     6,600,000 1,000,000
Minimum number of shares of common stock repurchased     100,000     6,000,000  
Share repurchased     $ 505   $ 1,832    
Average price (in dollars per share)     $ 16.29     $ 11.03