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Stockholders Equity and Equity Compensation Plans (Details Textual) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 0 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Performance Shares
Jun. 30, 2014
Restricted common stock
Jun. 30, 2014
Restricted common stock
May 22, 2014
Stock Incentive Plan 2005
Jun. 30, 2014
Stock Incentive Plan 2005
Dec. 31, 2013
Stock Incentive Plan 2005
Jun. 30, 2014
Dividend Paid
Jun. 30, 2013
Dividend Paid
Stockholders Equity and Equity Compensation Plans (Additional Textual) [Abstract]                        
Shares repurchased       0.5                
Total amount paid       $ 10.0                
Weighted-average price per share       $ 20.21                
Remaining number of shares available for repurchase 2.1   2.1                  
Repurchase of common stock for employee tax withholdings, shares     0.2 0.2                
Repurchase of common stock for tax withholdings, value     6.6 4.9                
Cash dividends declared per common share $ 0.1575 $ 0.1500 $ 0.3075 $ 0.1500                
Cash dividend 5.4 5.1                    
Payment of cash dividends common stock                     10.5 5.1
Shareholders of Record Date Jun. 30, 2014                      
Dividend payment date Jun. 30, 2014                      
Number of increased authorized shares under incentive plan               2.9        
Number of authorized shares under incentive plan                 18.7 15.8    
Performance based awards granted to executive management shares         0.1              
Stock-based compensation expense $ 3.9 $ 3.9 $ 7.7 $ 7.5                
Stockholders' Equity and Equity Compensation Plans (Textual) [Abstract]                        
Common stock shares issued to members of executive management vesting installments         3 years 4 years 4 years