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Equity Compensation Plans - Options (Details)
 12 Months Ended
Dec. 31, 2016
USD ($)
item
$ / shares
shares
Dec. 31, 2015
$ / shares
shares
Dec. 31, 2014
shares
May 31, 2016
shares
Equity Compensation Plans        
Number of stock option grant awards outstanding | item 2      
Term of stock options granted 10 years      
Vesting period 3 years      
Shares        
Exercised (in shares) | $ $ (11,000)      
Ending outstanding (in dollars) | $ $ 32,040,000      
2009 Plan        
Equity Compensation Plans        
Shares issued 16,500      
Shares        
Ending outstanding (in shares) 9,000      
2007 Plan        
Equity Compensation Plans        
Shares issued 93,000      
Shares        
Ending outstanding (in shares) 85,500      
Incentive Plan        
Equity Compensation Plans        
Number of shares authorized 1,908,332      
Stock options        
Equity Compensation Plans        
Exercised (in shares)   0 0  
Total unrecognized compensation cost | $ $ 0      
Shares        
Beginning outstanding (in shares) 162,500      
Canceled (in shares) (36,500)      
Expired (in shares) (30,000)      
Exercised (in shares) | $ $ (1,500)      
Ending outstanding (in shares) 94,500 162,500    
Exercised (in dollars) | $ $ 2,790,000      
Exercisable at end of period (in shares) 94,500      
Weighted Average Exercise Price        
Beginning outstanding (in dollars per share) | $ / shares $ 27.03      
Canceled (in dollars per share) | $ / shares 29.20      
Expired (in dollars per share) | $ / shares 29.20      
Exercised (in dollars per share) | $ / shares 7.49      
Ending outstanding (in dollars per share) | $ / shares 25.82 $ 27.03    
Exercisable at end of period (in dollars per share) | $ / shares $ 25.82      
Weighted Average Remaining Contractual Term (years)        
Ending outstanding (in years) 1 year 1 month 6 days      
Exercisable at end of period 1 year 1 month 6 days      
Stock options | 2014 Plan        
Equity Compensation Plans        
Number of shares authorized     375,000 975,000
Stock options | 2009 Plan        
Equity Compensation Plans        
Exercised (in shares) (1,500)