Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity - Narrative (Details)

v3.3.0.814
Shareholders' Equity - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 100 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Nov. 30, 2014
Oct. 31, 2011
Mar. 31, 2007
Capital Unit [Line Items]                
Shares authorized for repurchase               2,500,000
Shares authorized for additional repurchase           10,000,000 5,000,000  
Shares repurchased, shares 2,586,427   4,066,669   10,662,821      
Shares repurchased, value $ 6,400   $ 11,837   $ 27,461      
Options forfeited 11,125   76,765          
Unrecognized compensation cost for stock based compensation $ 11,223   $ 11,223   11,223      
Unrecognized compensation cost for stock based compensation, period of recognition     2 years 4 months 28 days          
Purchase of shares 278,037   964,691          
Intrinsic value of options exercised $ 488   $ 2,320          
Share-based compensation 242 $ 3,679 5,926 $ 7,689        
Grands in 2015 [Member]                
Capital Unit [Line Items]                
Unrecognized compensation cost for stock based compensation 2,964   $ 2,964   2,964      
Unrecognized compensation cost for stock based compensation, period of recognition     2 years 10 months 28 days          
Restricted shares                
Capital Unit [Line Items]                
Unrecognized compensation cost for stock based compensation 3,790   $ 3,790   $ 3,790      
Unrecognized compensation cost for stock based compensation, period of recognition     3 years 3 months 8 days          
Share-based compensation (1,185)   $ 1,445          
Restricted shares | Grands in 2015 [Member]                
Capital Unit [Line Items]                
Unrecognized compensation cost for stock based compensation, period of recognition     3 years 3 months 4 days          
Options                
Capital Unit [Line Items]                
Share-based compensation $ 1,427   $ 4,481