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Stock-Based Compensation Plans and Employee Benefits (Stock-Based Compensation) (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
point
shares
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
point
$ / shares
shares
Jun. 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 | $ $ 3,503 $ 3,915 $ 12,593 $ 9,796  
Number of Points Outstanding [Roll Forward]          
Accrued expenses | $ $ 87,734   $ 87,734   $ 101,035
Long-term Incentive Plan 2009          
Number of Points Outstanding [Roll Forward]          
Shares available for issuance | shares 2,700,000   2,700,000    
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)     (0.15)   (10.43)
Points at end of period 86.92   86.92   86.57
Preferred return hurdle         9.00%
Compensation value of total distribution | $     $ 13,600    
Cash portion of points distribution | $     $ 6,800    
Number of shares issued in points distribution | shares     595,869    
Value of shares issued in points distribution | $     $ 6,800    
Fair value of shares in points distribution | $ / shares     $ 11.41    
Number of shares issued, net of tax withholding in points distribution | shares     328,074    
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)     (0.89)   (7.82)
Points at end of period 83.27   83.27   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)     49.08   41.68
Forfeited (points)     (4.56)   (0.71)
Points at end of period 85.49   85.49   40.97
All Performance Incentive Plans          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense | $ $ 2,200 $ 2,900 $ 10,200 $ 7,900  
Number of Points Outstanding [Roll Forward]          
Accrued expenses | $ $ 34,300   $ 34,300   $ 38,100
Common Stock Subject to Sales Restriction | Employees          
Number of Points Outstanding [Roll Forward]          
Vested, number of shares | shares     213,609    
Restricted shares awarded | 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 | shares     264,000   116,000
Vested | shares     (40,000)   (75,000)
Forfeited | shares     (49,000)   (49,000)
Non-vested at end of period (in shares) | shares 457,000   457,000   282,000
Unrecognized compensation cost | $ $ 2,900   $ 2,900    
Weighted-average period to recognize the unrecognized compensation cost     1 year 11 months 27 days