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Stock-Based Compensation Plans and Employee Benefits (Stock-Based Compensation) (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2018
USD ($)
point
shares
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
point
$ / shares
shares
Sep. 30, 2017
USD ($)
point
shares
Dec. 31, 2017
USD ($)
point
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense | $ $ 3,651 $ 2,934 $ 16,245 $ 12,730  
Number of Points Outstanding [Roll Forward]          
Accrued expenses | $ $ 92,783   $ 92,783   $ 101,035
Long-term Incentive Plan 2009          
Number of Points Outstanding [Roll Forward]          
Shares available for issuance (in shares) | shares 2,600,000   2,600,000    
2013-2014 Performance Incentive Plan          
Number of Points Outstanding [Roll Forward]          
Points at beginning of period     86.57 92.00 92.00
Granted (points)     0.50   5.00
Forfeited (points)     (1.31)   (10.43)
Points at end of period 85.76   85.76   86.57
Preferred return hurdle         9.00%
Decrease in distributable return (percent)     4.30%    
Compensation value of total distribution | $     $ 14,300    
Cash portion of points distribution | $     $ 7,200    
Number of shares issued in points distribution (in shares) | shares     625,788    
Value of shares issued in points distribution | $     $ 7,100    
Fair value of shares in points distribution (in dollars per share) | $ / shares     $ 11.39    
Number of shares issued, net of tax withholding in points distribution (in shares) | shares     343,402    
2015-2016 Performance Plan          
Number of Points Outstanding [Roll Forward]          
Points at beginning of period     84.16 74.10 74.10
Granted (points)     0.00   17.88
Forfeited (points)     (4.80)   (7.82)
Points at end of period 79.36   79.36   84.16
2017-2018 Performance Incentive Plan          
Number of Points Outstanding [Roll Forward]          
Points at beginning of period     40.97 0.00 0.00
Granted (points)     49.33   41.68
Forfeited (points)     (7.88)   (0.71)
Points at end of period 82.42   82.42   40.97
All Performance Incentive Plans          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense | $ $ 2,400 $ 1,900 $ 12,600 $ 9,800  
Number of Points Outstanding [Roll Forward]          
Accrued expenses | $ $ 36,000   $ 36,000   $ 38,100
Common Stock Subject to Sales Restriction | Employees          
Number of Points Outstanding [Roll Forward]          
Vested, number of shares (in shares) | shares     213,609    
Restricted shares awarded (in shares) | shares     135,503    
Sale restriction period     18 months    
Restricted Stock Units          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]          
Non-vested at beginning of period (in shares) | shares     282,000 290,000 290,000
Granted (in shares) | shares     278,000   116,000
Vested (in shares) | shares     (45,000)   (75,000)
Forfeited (in shares) | shares     (61,000)   (49,000)
Non-vested at end of period (in shares) | shares 454,000   454,000   282,000
Unrecognized compensation cost | $ $ 2,400   $ 2,400    
Weighted-average period to recognize the unrecognized compensation cost     1 year 9 months 21 days