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Stock Compensation (Details) (USD $)
0 Months Ended 3 Months Ended 6 Months Ended
Mar. 02, 2012
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share based compensation expense allocation   $ 900,000 $ 1,000,000 $ 1,600,000 $ 1,600,000
Total unrecognized compensation cost related to non-vested share based compensation arrangements   4,300,000   4,300,000  
Options Granted (in shares)       323,950  
Vesting period, in years 3 years     3 years  
Expiration period, in years       10 years  
The total intrinsic value of all stock options exercised       $ 1,380,000 $ 4,000
Share-based Goods and Nonemployee Services Transaction, Valuation Method, Expected Term       3 years  
Restricted Stock [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period, in years       3 years  
Granted (in shares)       90,495  
Granted, Average Grant Date Fair Value (in dollars per share)       $ 12.96  
Restricted Stock [Member] | Minimum [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period, in years       3 years  
Restricted Stock [Member] | Maximum [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting period, in years       4 years  
2008 Plan [Member]
         
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares authorized for grant under plan (in shares)   3,000,000   3,000,000