Annual report pursuant to Section 13 and 15(d)

Equity Structure And Transactions (Details)

v2.4.0.6
Equity Structure And Transactions (Details) (USD $)
 1 Months Ended 12 Months Ended 12 Months Ended
Feb. 23, 2012
Mar. 31, 2009
Dec. 31, 2011
Dec. 31, 2009
Dec. 31, 2010
Dec. 31, 2011
Common Stock, Regular [Member]
Dec. 31, 2010
Common Stock, Regular [Member]
Dec. 31, 2009
Common Stock, Regular [Member]
Dec. 31, 2009
Common Stock [Member]
Dec. 31, 2011
Common Stock, Special [Member]
Dec. 31, 2010
Common Stock, Special [Member]
Equity Structure And Transactions [Line Items]                      
Preferred stock, shares authorized     2,000,000   2,000,000            
Preferred stock, par value     $ 0.00001   $ 0.00001            
Stock repurchase amount   $ 25,000,000                  
Stock repurchase program period, expiration date   Dec. 31, 2009                  
Repurchase of common stock, shares       2,869,173         (2,869,000)    
Shares purchased of common stock, value     24,167,000 24,200,000 24,167,000            
Paid cash dividends, per share           $ 0.16 $ 0.14 $ 0.12   $ 0.63 $ 0.66
Cash dividends       $ 9,150,000   $ 11,913,000 $ 10,446,000     $ 46,900,000 $ 49,200,000
Dividends declared, per common share $ 0.08                    
Dividends payable date     Mar. 30, 2012                
Dividends record date     Mar. 14, 2012