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Debt Obligations, net (Narrative) (Details)
shares in Millions
1 Months Ended 6 Months Ended 7 Months Ended 12 Months Ended
Sep. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
property
Jan. 31, 2017
USD ($)
Nov. 30, 2016
USD ($)
shares
Mar. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Oct. 31, 2017
USD ($)
Aug. 31, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2015
USD ($)
Debt Instrument [Line Items]                            
Increase of weighted average debt maturity           1 year 6 months                
Weighted average debt maturity           4 years                
Repayment of principal amount               $ 1,915,052,000 $ 1,437,557,000 $ 432,383,000        
Loss on early extinguishment of debt, net               14,724,000 1,619,000 281,000        
Conversion of senior unsecured convertible notes into common stock               $ 0 9,596,000 $ 0        
2017 Secured Financing                            
Debt Instrument [Line Items]                            
Debt instrument, face amount   $ 227,000,000.0                        
Stated interest rate (as a percent)   3.795%                        
Number of properties collateralizing loan | property   12                        
Debt issuance costs   $ 7,300,000                        
2016 Senior Secured Credit Facility                            
Debt Instrument [Line Items]                            
Debt instrument, face amount $ 400,000,000.0                     $ 500,000,000.0 $ 450,000,000.0  
Debt issuance costs $ 2,600,000           $ 6,200,000   6,200,000          
Percentage of par credit facilities were issued at                         99.00%  
Variable interest rate, spread (as a percent)               1.00%            
Price reduction (as a percent) 1.50%                          
Multiple of the minimum collateral coverage on outstanding borrowings           1.25   1.25            
Periodic principal payment (as a percent)               0.25%            
Lender fees             4,500,000              
Third party fees capitalized             $ 4,300,000              
Noncash debt issuance costs     $ 800,000                      
2016 Senior Secured Credit Facility | London Interbank Offered Rate (LIBOR)                            
Debt Instrument [Line Items]                            
Variable interest rate, spread (as a percent) 3.00%   3.75%       4.50% 3.00%            
2016 Senior Secured Credit Facility | London Interbank Offered Rate (LIBOR) | Minimum                            
Debt Instrument [Line Items]                            
Variable interest rate, spread (as a percent) 0.75%   1.00%       1.00% 0.75%            
2016 Senior Secured Credit Facility | London Interbank Offered Rate (LIBOR) | Maximum                            
Debt Instrument [Line Items]                            
Variable interest rate, spread (as a percent)               2.00%            
2015 Revolving Credit Facility                            
Debt Instrument [Line Items]                            
Maximum borrowing capacity                           $ 250,000,000.0
Repayment of principal amount         $ 5,000,000                  
2015 $325 Million Secured Revolving Credit Facility                            
Debt Instrument [Line Items]                            
Debt instrument, face amount           $ 325,000,000   $ 325,000,000            
Maximum borrowing capacity           $ 325,000,000.0   $ 325,000,000.0            
2015 $325 Million Secured Revolving Credit Facility | Minimum                            
Debt Instrument [Line Items]                            
Commitment fee percentage 0.30%                          
2015 $325 Million Secured Revolving Credit Facility | Maximum                            
Debt Instrument [Line Items]                            
Commitment fee percentage 0.50%                          
2015 $325 Million Secured Revolving Credit Facility | London Interbank Offered Rate (LIBOR)                            
Debt Instrument [Line Items]                            
Variable interest rate, spread (as a percent)               2.50%            
2015 $325 Million Secured Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Minimum                            
Debt Instrument [Line Items]                            
Variable interest rate, spread (as a percent)               1.00%            
4.625% senior notes                            
Debt Instrument [Line Items]                            
Debt instrument, face amount $ 400,000,000.0                          
Stated interest rate (as a percent) 4.625%         4.625%   4.625%            
5.25% senior notes                            
Debt Instrument [Line Items]                            
Stated interest rate (as a percent) 5.25%         5.25%   5.25%            
3.125% senior convertible notes                            
Debt Instrument [Line Items]                            
Debt instrument, face amount $ 250,000,000.0                   $ 37,500,000      
Stated interest rate (as a percent) 3.125%         3.125%   3.125%            
Unsecured Senior Notes                            
Debt Instrument [Line Items]                            
Debt issuance costs $ 18,600,000                          
Loss on early extinguishment of debt, net               $ 13,600,000 $ 400,000          
4.00% senior notes                            
Debt Instrument [Line Items]                            
Stated interest rate (as a percent) 4.00%         4.00%   4.00%            
Extinguishment of debt $ 550,000,000                          
7.125% senior notes                            
Debt Instrument [Line Items]                            
Stated interest rate (as a percent) 7.125%         7.125%   7.125%            
Extinguishment of debt $ 300,000,000                          
4.875% senior notes                            
Debt Instrument [Line Items]                            
Stated interest rate (as a percent) 4.875%         4.875%   4.875%            
Extinguishment of debt $ 300,000,000                          
6.00% senior notes                            
Debt Instrument [Line Items]                            
Debt instrument, face amount   $ 375,000,000.0                        
Stated interest rate (as a percent)   6.00%       6.00%   6.00%            
5.85% senior notes                            
Debt Instrument [Line Items]                            
Stated interest rate (as a percent)   5.85%       5.85%   5.85%            
Extinguishment of debt   $ 99,700,000                        
9.00% senior notes                            
Debt Instrument [Line Items]                            
Stated interest rate (as a percent)   9.00%       9.00%   9.00%            
Extinguishment of debt   $ 275,000,000                        
5.875% senior notes                            
Debt Instrument [Line Items]                            
Stated interest rate (as a percent)         5.875%                  
Extinguishment of debt         $ 261,400,000                  
6.50% senior notes                            
Debt Instrument [Line Items]                            
Debt instrument, face amount         $ 275,000,000                  
Stated interest rate (as a percent)         6.50% 6.50%   6.50%            
Unsecured Notes 3.875 Percent Senior Notes Due July 2016                            
Debt Instrument [Line Items]                            
Extinguishment of debt         $ 265,000,000                  
3.00% senior convertible notes                            
Debt Instrument [Line Items]                            
Stated interest rate (as a percent)       3.00%                    
Repayment of principal amount       $ 200,000,000                    
Conversion of senior unsecured convertible notes into common stock       $ 9,600,000                    
Shares of common stock converted (in shares) | shares       0.8                    
Safety, Income and Growth, Inc. | 2017 Secured Financing                            
Debt Instrument [Line Items]                            
Recourse triggering event, equity capitalization amount 500,000,000.0                          
Recourse triggering event, net assets 250,000,000.0                          
Other Expense | 2016 Senior Secured Credit Facility                            
Debt Instrument [Line Items]                            
Lender fees 1,100,000                          
Third party fees recognized $ 1,500,000           $ 1,900,000              
Loss on early extinguishment of debt, net               $ 800,000