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Notes Payable (Schedule of Long-term Debt) (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2017
Mar. 08, 2017
Dec. 31, 2016
Debt Instrument [Line Items]      
Liabilities, fair value $ 1,735   $ 785
Total principal amount 375,000   320,000
Less unamortized discount and debt issuance costs(4) 3,764   0
Notes payable 371,236   320,000
Level 2 [Member]      
Debt Instrument [Line Items]      
Liabilities, fair value 1,589   765
Level 2 [Member] | Secured Notes One [Member]      
Debt Instrument [Line Items]      
Secured notes 0   120,000
Level 2 [Member] | Secured Notes Two [Member]      
Debt Instrument [Line Items]      
Secured notes 0   20,000
Unsecured debt [Member]      
Debt Instrument [Line Items]      
Interest rate   4.40%  
Unsecured debt [Member] | Borrowings [Member]      
Debt Instrument [Line Items]      
Liabilities, fair value 385,733   180,000
Notes payable 371,236   180,000
Unsecured debt [Member] | Borrowings [Member] | Level 2 [Member]      
Debt Instrument [Line Items]      
Liabilities, fair value 385,733   180,000
Unsecured debt [Member] | Borrowings [Member] | Level 2 [Member] | Unsecured Notes One [Member]      
Debt Instrument [Line Items]      
Liabilities, fair value $ 0   180,000
Unsecured debt [Member] | Borrowings [Member] | Level 2 [Member] | Unsecured Notes Two [Member]      
Debt Instrument [Line Items]      
Interest rate 4.40%    
Unsecured debt $ 375,000   0
Unsecured debt [Member] | Borrowings [Member] | Level 2 [Member] | Unsecured Notes Three [Member]      
Debt Instrument [Line Items]      
Liabilities, fair value $ 0   $ 0
LIBOR [Member] | Level 2 [Member] | Secured Notes One [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 0.40%    
LIBOR [Member] | Level 2 [Member] | Secured Notes Two [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 0.40%    
LIBOR [Member] | Minimum [Member] | Unsecured debt [Member] | Borrowings [Member] | Level 2 [Member] | Unsecured Notes One [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 0.1125%    
LIBOR [Member] | Minimum [Member] | Unsecured debt [Member] | Borrowings [Member] | Level 2 [Member] | Unsecured Notes Three [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 0.1125%    
LIBOR [Member] | Maximum [Member] | Unsecured debt [Member] | Borrowings [Member] | Level 2 [Member] | Unsecured Notes One [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 0.1625%    
LIBOR [Member] | Maximum [Member] | Unsecured debt [Member] | Borrowings [Member] | Level 2 [Member] | Unsecured Notes Three [Member]      
Debt Instrument [Line Items]      
Basis spread on variable rate 0.1625%