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Share-Based Compensation - Narrative (Details) - USD ($)
9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense   $ 21,700,000 $ 22,600,000 $ 90,200,000
Share-based compensation, capitalized   $ 5,900,000 $ 6,000,000 5,600,000
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period (in years)   4 years    
Unrecognized compensation cost related to unvested awards   $ 18,000,000    
Unrecognized compensation cost, period of recognition (in years)   1 year 10 months 24 days    
Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period (in years)   4 years    
Performance Unit and Performance Share Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period (in years) 3 years      
Performance Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost, period of recognition (in years)   1 year    
Amount paid related to fully vested awards   $ 0    
Performance Share Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost related to unvested awards   $ 100,000    
Unrecognized compensation cost, period of recognition (in years)   2 years    
Vesting Four Years from Grant Date | Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period (in years)   4 years    
Unrecognized compensation cost related to unvested awards   $ 900,000    
Unrecognized compensation cost, period of recognition (in years)   3 years 2 months 12 days    
Vesting Two Years from Grant Date | Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period (in years)   2 years    
Unrecognized compensation cost related to unvested awards   $ 200,000    
Unrecognized compensation cost, period of recognition (in years)   1 year    
Percentage vesting at the end of the first year   40.00%    
Percentage vesting at the end of the second year   60.00%    
Discount from common stock price using a credit spread, percentage   10.60%    
Former Company Executives        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense       $ 48,500,000