Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Summary of nonvested restricted stock award activity) (Details)

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Stockholders' Equity (Summary of nonvested restricted stock award activity) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]  
Nonvested, Beginning (shares) 1,127
Granted (Shares) 621
Vested (Shares) (48)
Forfeited (Shares) (1)
Nonvested, Ending (shares) 1,699
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Nonvested Weighted Average Grant Date Fair Value [Roll Forward]  
Nonvested, Beginning (Weighted Average Grant Date Fair Value) $ 9.59
Granted (Weighted Average Grant Date Fair Value) $ 8.17
Vested (Weighted Average Grant Date Fair Value) $ 5.81
Forfeited (Weighted Average Grant Date Fair Value) $ 9.84
Nonvested, Ending (Weighted Average Grant Date Fair Value) $ 9.16