Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity - Narrative (Details)

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Shareholders' Equity - Narrative (Details) - USD ($)
$ in Thousands
 3 Months Ended 106 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
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 1,523,392   13,792,959      
Shares repurchased, value $ 3,664   $ 35,643      
Shares available for purchase (in shares) 3,707,041   3,707,041      
Non-cash compensation expense $ 1,355 $ 3,260        
Options            
Capital Unit [Line Items]            
Options forfeited (in shares) 52,428          
Unrecognized compensation cost for stock based compensation $ 12,166   $ 12,166      
Unrecognized compensation cost for stock based compensation, period of recognition 2 years 5 months 9 days          
Purchase of shares 1,304,539          
Intrinsic value of options exercised $ 1,717          
Options | Awards Granted in 2016 [Member]            
Capital Unit [Line Items]            
Unrecognized compensation cost for stock based compensation $ 950   950      
Unrecognized compensation cost for stock based compensation, period of recognition 3 years 9 months          
Restricted shares            
Capital Unit [Line Items]            
Unrecognized compensation cost for stock based compensation $ 5,922   5,922      
Unrecognized compensation cost for stock based compensation, period of recognition 3 years 2 months 12 days          
Restricted shares | Employees            
Capital Unit [Line Items]            
Non-cash compensation expense $ 1,352          
Restricted shares | Consultants and Independent Financial Advisors            
Capital Unit [Line Items]            
Non-cash compensation expense 3          
Restricted shares | Awards Granted in 2016 [Member]            
Capital Unit [Line Items]            
Unrecognized compensation cost for stock based compensation $ 2,699   $ 2,699      
Unrecognized compensation cost for stock based compensation, period of recognition 3 years 9 months