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Stock Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Number of shares      
Outstanding, beginning of year (in shares) 46,244 67,893 108,596
Granted (in shares) 0 0 0
Exercised (in shares) 0 0 0
Forfeited (in shares) (26,141) (21,649) (40,703)
Outstanding, end of year (in shares) 20,103 46,244 67,893
Exercisable, end of year (in shares) 20,103 44,925 59,799
Weighted average exercise price      
Outstanding, beginning of year (in dollars per share) $ 19.33 $ 19.88 $ 19.19
Granted (in dollars per share) 0.00 0.00 0.00
Exercised (in dollars per share) 0.00 0.00 0.00
Forfeited (in dollars per share) 22.84 21.04 20.01
Outstanding, end of year (in dollars per share) 14.77 19.33 19.88
Exercisable, end of year (in dollars per share) $ 14.77 $ 19.47 $ 20.57
Weighted average Contractual Term (in years)      
Outstanding, end of year 8 months 23 days 11 months 27 days 1 year 4 months 28 days
Exercisable, end of year 8 months 23 days 11 months 19 days 1 year 2 months 27 days
Aggregate Intrinsic Value      
Outstanding, end of year $ 120,231 $ 49,837 $ 0
Exercisable, end of year $ 120,231 $ 46,870 $ 0