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Notes and Contracts Payable (Schedule of Notes and Contracts Payable) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Line of credit borrowings due May 14, 2019, weighted-average interest rate of 2.52% at December 31, 2016 $ 160,000 $ 0
Trust deed notes with maturities through 2023, collateralized by land and buildings with net book values of $47,846 and $50,514 at December 31, 2016 and 2015, respectively, weighted-average interest rate of 5.31% and 5.34%, at December 31, 2016 and 2015, respectively 26,646 30,308
Other notes and contracts payable with maturities through 2032, weighted-average interest rate of 5.26% and 4.21% at December 31, 2016 and 2015, respectively 4,269 5,540
Notes and contracts payable 740,915 585,848
Unamortized discount – senior unsecured notes (655) (746)
Debt issuance costs – senior unsecured notes (3,567) (4,050)
Notes and contracts payable 736,693 581,052
4.60% unsecured notes    
Debt Instrument [Line Items]    
Senior unsecured notes 300,000 300,000
4.30% unsecured notes    
Debt Instrument [Line Items]    
Senior unsecured notes $ 250,000 $ 250,000