Annual report pursuant to Section 13 and 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
12 Months Ended
Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]  
Nonvested, Beginning (shares) 1,561
Granted (Shares) 731
Vested (Shares) (1,156)
Forfeited (Shares) (9)
Nonvested, Ending (shares) 1,127
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) $ 6.89
Granted (Weighted Average Grant Date Fair Value) $ 9.23
Vested (Weighted Average Grant Date Fair Value) $ 5.73
Forfeited (Weighted Average Grant Date Fair Value) $ 10.90
Nonvested, Ending (Weighted Average Grant Date Fair Value) $ 9.59