XML 48 R38.htm IDEA: XBRL DOCUMENT v3.7.0.1
Debt - Senior Unsecured Credit Facility (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Line of Credit Facility [Line Items]        
Percent of unused portion line of credit facility triggering lower commitment fee (as a percent)     50.00%  
Net proceeds from future equity issuances (as a percent)     75.00%  
Unsecured credit facility        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity (up to) $ 300,000,000   $ 300,000,000  
Increase in credit facility 600,000,000   600,000,000  
Senior unsecured credit facility 0   0  
Interest and unused credit facility fees $ 200,000 $ 400,000 $ 500,000 $ 800,000
Minimum        
Line of Credit Facility [Line Items]        
Line of credit facility, unused capacity, commitment fee (as a percent)     0.20%  
Maximum        
Line of Credit Facility [Line Items]        
Line of credit facility, unused capacity, commitment fee (as a percent)     0.30%  
Line Of Credit Facility Covenant Actual Results        
Line of Credit Facility [Line Items]        
Maximum leverage ratio (as a percent) 0.250   0.250  
Minimum fixed charge coverage ratio     4.62  
Minimum tangible net worth $ 2,590,000,000   $ 2,590,000,000  
Secured recourse indebtedness ratio     21.10%  
Line Of Credit Facility Covenant        
Line of Credit Facility [Line Items]        
Maximum leverage ratio (as a percent) 0.60   0.60  
Minimum fixed charge coverage ratio     1.5  
Minimum tangible net worth $ 1,913,306,000   $ 1,913,306,000  
Secured recourse indebtedness ratio     45.00%  
LIBOR | Unsecured credit facility        
Line of Credit Facility [Line Items]        
Basis spread on variable rate     1.50%  
LIBOR | Minimum | Unsecured credit facility        
Line of Credit Facility [Line Items]        
Basis spread on variable rate     1.75%  
LIBOR | Maximum | Unsecured credit facility        
Line of Credit Facility [Line Items]        
Basis spread on variable rate     2.75%  
Less than or equal to 35% | Maximum | Unsecured credit facility        
Line of Credit Facility [Line Items]        
Ratio Of Net Indebtedness to Ebitda     0.35  
Less than or equal to 35% | LIBOR | Unsecured credit facility        
Line of Credit Facility [Line Items]        
Basis spread on variable rate     1.50%  
Greater than 35% but less than or equal to 45% | Minimum | Unsecured credit facility        
Line of Credit Facility [Line Items]        
Ratio Of Net Indebtedness to Ebitda     0.35  
Greater than 35% but less than or equal to 45% | Maximum | Unsecured credit facility        
Line of Credit Facility [Line Items]        
Ratio Of Net Indebtedness to Ebitda     0.45  
Greater than 35% but less than or equal to 45% | LIBOR | Unsecured credit facility        
Line of Credit Facility [Line Items]        
Basis spread on variable rate     1.65%  
Greater than 45% but less than or equal to 50% | Minimum | Unsecured credit facility        
Line of Credit Facility [Line Items]        
Ratio Of Net Indebtedness to Ebitda     0.45  
Greater than 45% but less than or equal to 50% | Maximum | Unsecured credit facility        
Line of Credit Facility [Line Items]        
Ratio Of Net Indebtedness to Ebitda     0.50  
Greater than 45% but less than or equal to 50% | LIBOR | Unsecured credit facility        
Line of Credit Facility [Line Items]        
Basis spread on variable rate     1.80%  
Greater than 50% but less than or equal to 55% | Minimum | Unsecured credit facility        
Line of Credit Facility [Line Items]        
Ratio Of Net Indebtedness to Ebitda     0.50  
Greater than 50% but less than or equal to 55% | Maximum | Unsecured credit facility        
Line of Credit Facility [Line Items]        
Ratio Of Net Indebtedness to Ebitda     0.55  
Greater than 50% but less than or equal to 55% | LIBOR | Unsecured credit facility        
Line of Credit Facility [Line Items]        
Basis spread on variable rate     2.00%  
Greater than 55% | Minimum | Unsecured credit facility        
Line of Credit Facility [Line Items]        
Ratio Of Net Indebtedness to Ebitda     0.55  
Greater than 55% | LIBOR | Unsecured credit facility        
Line of Credit Facility [Line Items]        
Basis spread on variable rate     2.25%