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Debt Obligations, net (Schedule of Debt) (Details) - USD ($)
$ / shares in Units, shares in Millions
1 Months Ended 12 Months Ended
Jun. 30, 2016
Mar. 31, 2012
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Aug. 31, 2016
Mar. 31, 2016
Debt Instrument [Line Items]              
Total debt obligations     $ 3,418,357,000 $ 4,150,389,000      
Debt discounts and deferred financing costs, net     (28,449,000) (31,566,000)      
Total long-term debt obligations, net     3,389,908,000 4,118,823,000      
Conversion of senior unsecured convertible notes into common stock     9,596,000 0 $ 0    
Interest costs capitalized     5,800,000 5,300,000 $ 4,900,000    
2015 Revolving Credit Facility              
Debt Instrument [Line Items]              
Total debt obligations     0 250,000,000      
Debt instrument, face amount     $ 250,000,000        
2015 Revolving Credit Facility | London Interbank Offered Rate (LIBOR)              
Debt Instrument [Line Items]              
Variable interest rate, spread     2.75%        
2015 Revolving Credit Facility | London Interbank Offered Rate (LIBOR) | Base Rate              
Debt Instrument [Line Items]              
Variable interest rate, spread     1.00%        
2015 Revolving Credit Facility | Federal Funds Effective Swap Rate | Base Rate              
Debt Instrument [Line Items]              
Variable interest rate, spread     0.50%        
2015 Revolving Credit Facility | Minimum | London Interbank Offered Rate (LIBOR)              
Debt Instrument [Line Items]              
Debt instrument, margin     2.25%        
2015 Revolving Credit Facility | Minimum | Base Rate              
Debt Instrument [Line Items]              
Debt instrument, margin     1.25%        
2015 Revolving Credit Facility | Maximum | London Interbank Offered Rate (LIBOR)              
Debt Instrument [Line Items]              
Debt instrument, margin     2.75%        
2015 Revolving Credit Facility | Maximum | Base Rate              
Debt Instrument [Line Items]              
Debt instrument, margin     1.75%        
2016 Senior Secured Credit Facility              
Debt Instrument [Line Items]              
Total debt obligations     $ 498,648,000 0      
Debt instrument, face amount $ 450,000,000.0         $ 500,000,000.0  
Variable interest rate, spread     1.00%        
2016 Senior Secured Credit Facility | London Interbank Offered Rate (LIBOR)              
Debt Instrument [Line Items]              
Variable interest rate, spread 4.50%   4.50%        
2016 Senior Secured Credit Facility | Federal Funds Effective Swap Rate              
Debt Instrument [Line Items]              
Variable interest rate, spread     0.50%        
2016 Senior Secured Credit Facility | Minimum | London Interbank Offered Rate (LIBOR)              
Debt Instrument [Line Items]              
Variable interest rate, spread 1.00%   1.00%        
2016 Senior Secured Credit Facility | Maximum | London Interbank Offered Rate (LIBOR)              
Debt Instrument [Line Items]              
Variable interest rate, spread     3.50%        
Mortgages collateralized by net lease assets              
Debt Instrument [Line Items]              
Total debt obligations     $ 249,987,000 $ 239,547,000      
Weighted average interest rate     5.10%        
Mortgages collateralized by net lease assets | London Interbank Offered Rate (LIBOR)              
Debt Instrument [Line Items]              
Variable interest rate, spread     2.00% 2.00%      
Mortgages collateralized by net lease assets | Minimum              
Debt Instrument [Line Items]              
Stated interest rate (as a percent)     3.875%        
Mortgages collateralized by net lease assets | Maximum              
Debt Instrument [Line Items]              
Stated interest rate (as a percent)     7.26%        
2012 Tranche A-2 Facility              
Debt Instrument [Line Items]              
Total debt obligations     $ 0 $ 339,717,000      
Debt instrument, face amount   $ 470,000,000          
Variable interest rate, spread     5.75%        
2012 Tranche A-2 Facility | London Interbank Offered Rate (LIBOR)              
Debt Instrument [Line Items]              
Variable interest rate, spread     5.75%        
Total secured credit facilities and mortgages              
Debt Instrument [Line Items]              
Total debt obligations     $ 748,635,000 829,264,000      
5.875% senior notes              
Debt Instrument [Line Items]              
Total debt obligations     $ 0 261,403,000      
Stated interest rate (as a percent)     5.875%       5.875%
3.875% senior notes              
Debt Instrument [Line Items]              
Total debt obligations     $ 0 265,000,000      
Stated interest rate (as a percent)     3.875%        
3.00% senior convertible notes              
Debt Instrument [Line Items]              
Total debt obligations     $ 0 $ 200,000,000      
Stated interest rate (as a percent)       3.00%      
Convertible debt conversion ratio     0.0085        
Conversion price (in dollars per share)       $ 11.77      
Conversion of senior unsecured convertible notes into common stock     $ 9,600,000 $ 9,600,000      
Shares of common stock converted (in shares)     0.8        
1.50% senior convertible notes              
Debt Instrument [Line Items]              
Total debt obligations     $ 0 $ 200,000,000      
Stated interest rate (as a percent)       1.50%      
Convertible debt conversion ratio     0.00578        
Conversion price (in dollars per share)       $ 17.29      
5.85% senior notes              
Debt Instrument [Line Items]              
Total debt obligations     $ 99,722,000 $ 99,722,000      
Stated interest rate (as a percent)     5.85%        
9.00% senior notes              
Debt Instrument [Line Items]              
Total debt obligations     $ 275,000,000 275,000,000      
Stated interest rate (as a percent)     9.00%        
4.00% senior notes              
Debt Instrument [Line Items]              
Total debt obligations     $ 550,000,000 550,000,000      
Stated interest rate (as a percent)     4.00%        
7.125% senior notes              
Debt Instrument [Line Items]              
Total debt obligations     $ 300,000,000 300,000,000      
Stated interest rate (as a percent)     7.125%        
4.875% senior notes              
Debt Instrument [Line Items]              
Total debt obligations     $ 300,000,000 300,000,000      
Stated interest rate (as a percent)     4.875%        
5.00% senior notes              
Debt Instrument [Line Items]              
Total debt obligations     $ 770,000,000 770,000,000      
Stated interest rate (as a percent)     5.00%        
6.50% senior notes              
Debt Instrument [Line Items]              
Total debt obligations     $ 275,000,000 0      
Stated interest rate (as a percent)     6.50%       6.50%
Unsecured Notes              
Debt Instrument [Line Items]              
Total debt obligations     $ 2,569,722,000 3,221,125,000      
Trust preferred securities              
Debt Instrument [Line Items]              
Total debt obligations     $ 100,000,000 $ 100,000,000      
Trust preferred securities | London Interbank Offered Rate (LIBOR)              
Debt Instrument [Line Items]              
Variable interest rate, spread     1.50%        
Term Loan for Remaining Balance After Maturity | London Interbank Offered Rate (LIBOR)              
Debt Instrument [Line Items]              
Debt instrument term     1 year        
2012 Tranche A-1 Facility              
Debt Instrument [Line Items]              
Debt instrument, face amount   $ 410,000,000          
Variable interest rate, spread     4.00%        
2012 Tranche A-1 Facility | Minimum | London Interbank Offered Rate (LIBOR)              
Debt Instrument [Line Items]              
Variable interest rate, spread   1.25%