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Incentive Compensation - Summary of Stock Option Activity (Details)
12 Months Ended
Dec. 31, 2018
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Weighted-Average Exercise Price, Outstanding at December 31, 2017 | $ / shares $ 17.20
Weighted-Average Exercise Price, Cancelled or expired | $ / shares 18.00
Weighted-Average Exercise Price, Outstanding at December 31, 2018 | $ / shares 17.08
Weighted-Average Exercise Price, Options vested and expected to vest at December 31, 2018 | $ / shares 17.14
Weighted-Average Exercise Price, Options exercisable at December 31, 2018 | $ / shares $ 17.20
Weighted-Average Remaining Contractual Term (in years), Outstanding at December 31, 2018 6 years 8 months 12 days
Weighted-Average Remaining Contractual Term (in years), Options vested and expected to vest at December 31, 2018 6 years 6 months
Weighted-Average Remaining Contractual Term (in years), Options exercisable at December 31, 2018 6 years 2 months 12 days
Employee Stock Option [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Shares, Outstanding at December 31, 2017 2,448,743
Shares, Granted 0
Shares, Cancelled or expired (316,800)
Shares, Outstanding at December 31, 2018 2,131,943
Shares, Options vested and expected to vest at December 31, 2018 2,083,994
Shares, Options exercisable at December 31, 2018 1,496,664