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Stock-Based Compensation - Stock Option Activity (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Shares    
Outstanding at beginning of period (in shares) 194,482 300,658
Granted (in shares) 90,248 0
Exercised (in shares) (38,844) (3,300)
Forfeited or expired (in shares) (35,744) (71,682)
Outstanding at end of period (in shares) 210,142 225,676
Vested and expected to vest at end of period (in shares) 210,142  
Exercisable at end of period (in shares) 210,142  
Weighted-Average Exercise Price    
Outstanding at beginning of period (in usd per share) $ 15.82 $ 17.48
Granted (in usd per share) $ 10.72 $ 0.00
Exercised (in usd per share) $ 10.98 $ 11.35
Forfeited or expired (in usd per share) $ 23.66 $ 22.56
Outstanding at end of period (in usd per share) $ 13.19 $ 15.96
Vested and expected to vest at end of period (in usd per share) $ 13.19  
Exercisable at end of period (in usd per share) $ 13.19  
Weighted-Average Remaining Contractual Term, Outstanding 3 years 3 months 18 days 3 years 8 months 12 days
Weighted-Average Remaining Contractual Term, Vested and expected to vest 3 years 3 months 18 days  
Weighted-Average Remaining Contractual Term, Exercisable 3 years 3 months 18 days  
Aggregate Intrinsic Value, Outstanding $ 677 $ 240
Aggregate Intrinsic Value, Vested and expected to vest 677  
Aggregate Intrinsic Value, Exercisable $ 677