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Debt Obligations, net (Schedule of Debt) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Jun. 10, 2014
Nov. 13, 2013
May. 31, 2013
Debt Instrument [Line Items]            
Total debt obligations $ 4,150,389 $ 4,034,349        
Debt discounts, net (6,706) (11,665)        
Total long-term debt obligations, net 4,143,683 4,022,684        
Interest costs capitalized 5,300 4,900 $ 2,600      
2012 Tranche A-2 Facility            
Debt Instrument [Line Items]            
Total debt obligations $ 339,717 358,504        
Stated interest rate 7.00%          
Variable interest rate, basis LIBOR          
Variable interest rate, spread 5.75%          
2012 Tranche A-2 Facility | Minimum            
Debt Instrument [Line Items]            
Variable interest rate, spread 1.25%          
2015 Revolving Credit Facility            
Debt Instrument [Line Items]            
Total debt obligations $ 250,000 0        
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%          
Term loans collateralized by net lease assets            
Debt Instrument [Line Items]            
Total debt obligations $ 239,547 248,955        
Stated interest rate, minimum 4.85%          
Stated interest rate, maximum 7.26%          
Weighted average interest rate 5.30%          
Term loans collateralized by net lease assets | London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Variable interest rate, spread 2.00%          
Total secured credit facilities and term loans            
Debt Instrument [Line Items]            
Total debt obligations $ 829,264 607,459        
6.05% senior notes            
Debt Instrument [Line Items]            
Total debt obligations $ 0 105,765        
Stated interest rate 6.05%          
5.875% senior notes            
Debt Instrument [Line Items]            
Total debt obligations $ 261,403 261,403        
Stated interest rate 5.875%          
3.875% senior notes            
Debt Instrument [Line Items]            
Total debt obligations $ 265,000 265,000        
Stated interest rate 3.875%         3.875%
3.00% senior convertible notes            
Debt Instrument [Line Items]            
Total debt obligations $ 200,000 200,000        
Stated interest rate 3.00%          
Conversion price $ 11.77          
Convertible debt conversion ratio 0.085          
1.50% senior convertible notes            
Debt Instrument [Line Items]            
Total debt obligations $ 200,000 200,000        
Stated interest rate 1.50%       1.50%  
Conversion price $ 17.29          
Convertible debt conversion ratio 0.0578          
5.85% senior notes            
Debt Instrument [Line Items]            
Total debt obligations $ 99,722 99,722        
Stated interest rate 5.85%          
9.00% senior notes            
Debt Instrument [Line Items]            
Total debt obligations $ 275,000 275,000        
Stated interest rate 9.00%          
4.00% senior notes            
Debt Instrument [Line Items]            
Total debt obligations $ 550,000 550,000        
Stated interest rate 4.00%     4.00%    
7.125% senior notes            
Debt Instrument [Line Items]            
Total debt obligations $ 300,000 300,000        
Stated interest rate 7.125%          
4.875% senior notes            
Debt Instrument [Line Items]            
Total debt obligations $ 300,000 300,000        
Stated interest rate 4.875%         4.875%
5.00% senior notes            
Debt Instrument [Line Items]            
Total debt obligations $ 770,000 770,000        
Stated interest rate 5.00%     5.00%    
Unsecured Notes            
Debt Instrument [Line Items]            
Total debt obligations $ 3,221,125 3,326,890        
Other debt obligations            
Debt Instrument [Line Items]            
Total debt obligations $ 100,000 $ 100,000        
Variable interest rate, basis LIBOR          
Variable interest rate, spread 1.50%          
2012 Tranche A-1 Facility            
Debt Instrument [Line Items]            
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%