Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity - Narrative (Details)

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Shareholders' Equity - Narrative (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended 88 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Sep. 30, 2014
Oct. 31, 2011
Mar. 31, 2007
Capital Unit [Line Items]          
Shares authorized for repurchase         2,500,000
Shares authorized for additional repurchase       5,000,000  
Shares repurchased, shares 1,280,400 2,444,490 6,194,247    
Shares repurchased, value $ 4,674 $ 8,090 $ 14,179    
Options forfeited   201,413      
Unrecognized compensation cost for stock based compensation 13,813 13,813 13,813    
Unrecognized compensation cost for stock based compensation, period of recognition   1 year 10 months 2 days      
Purchase of shares 498,976 1,787,913      
Intrinsic value of options exercised 1,187 3,354      
Awards granted during 2012
         
Capital Unit [Line Items]          
Unrecognized compensation cost for stock based compensation $ 4,698 $ 4,698 $ 4,698    
Unrecognized compensation cost for stock based compensation, period of recognition   3 years 0 months 22 days