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Incentive Plan - Summary of Stock Options Outstanding (Details) - USD ($)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Number of Options Granted    
Outstanding, beginning of period (in shares) 595,736  
Options granted (in shares) 0  
Options forfeited (in shares) (6,474)  
Options exercised (in shares) 0 0
Options expired (in shares) (77,704)  
Outstanding, end of period (in shares) 511,558  
Exercisable, end of period, number of options granted (in shares) 341,052  
Vested or expected to vest, end of period, number of options granted (in shares) 170,506  
Weighted Average Exercise Price    
Outstanding, beginning of period (dollars per share) $ 39.23  
Options granted (dollars per share) 0  
Options forfeited (dollars per share) 40.12  
Options exercised (dollars per share) 0  
Options expired (dollars per share) 39.30  
Outstanding, end of period (dollars per share) 39.23  
Exercisable, end of period (dollars per share) 39.23  
Vested or expected to vest, end of period (dollars per share) $ 39.23  
Weighted Average Remaining Contractual Term    
Outstanding, end of period 7 years 3 months 18 days  
Exercisable, end of period 7 years 3 months 18 days  
Vested or expected to vest, end of period 7 years 3 months 18 days  
Aggregate Intrinsic Value    
Outstanding, end of period $ 0  
Exercisable, end of period 0  
Vested or expected to vest, end of period $ 0