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Shareholders' Equity / Partners' Capital - Stock Option Activity (Details) - Stock options - 2012 Equity Incentive Plan - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]        
Options outstanding, beginning of period (in shares) 3,052,450 2,826,500 2,484,400  
Granted (in shares) 140,000 385,200 708,000  
Exercised (in shares) (769,875) (74,000) (196,000)  
Forfeited (in shares) (170,300) (85,250) (169,900)  
Options outstanding, end of period (in shares) 2,252,275 3,052,450 2,826,500 2,484,400
Share-based Compensation Arrangement by Share-based Payment Award, Weighted Average Exercise Price [Roll Forward]        
Options outstanding, beginning balance (in dollars per share) $ 16.65 $ 15.69 $ 16.22  
Granted (in dollars per share) 19.40 23.38 14.15  
Exercised (in dollars per share) 16.07 15.65 16.18  
Forfeited (in dollars per share) 17.93 16.24 16.38  
Options outstanding, ending balance (in dollars per share) $ 16.92 $ 16.65 $ 15.69 $ 16.22
Options outstanding, weighted average contractual life 6 years 1 month 6 days 6 years 10 months 10 days 7 years 7 months 6 days 8 years 7 days
Share-based Compensation Arrangement by Share-based Payment Award, Intrinsic Value [Roll Forward]        
Options outstanding, intrinsic value $ 7,713 $ 16,421 $ 14,956 $ 1,225
Exercised, intrinsic value $ 4,754 $ 520 $ 790  
Options exercisable at period end (in shares) 1,569,800      
Options exercisable at period end (in dollars per share) $ 16.21      
Options exercisable at period end, weighted average contractual life 5 years 4 months 24 days      
Options exercisable at period end, intrinsic value $ 6,018