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Stock-Based Compensation Plans and Employee Benefits (Stock-based Compensation) (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
USD ($)
point
$ / shares
shares
Mar. 31, 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 | $ $ 9,091 $ 5,881  
Number of Points Outstanding [Roll Forward]      
Accrued expenses | $ $ 75,995   $ 101,035
Long-term Incentive Plan 2009      
Number of Points Outstanding [Roll Forward]      
Shares available for issuance | shares 2,700,000    
Restricted Stock Units (RSUs) [Member]      
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 (20,000)   (75,000)
Forfeited | shares (40,000)   (49,000)
Non-vested at end of period (in shares) | shares 486,000   282,000
Unrecognized compensation cost | $ $ 3,500    
Weighted-average period to recognize the unrecognized compensation cost 2 years 2 months 12 days    
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   86.57
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   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   40.97
All Performance Incentive Plans      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock-based compensation expense | $ $ 7,900 $ 5,000  
Number of Points Outstanding [Roll Forward]      
Accrued expenses | $ $ 32,200   $ 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