Annual report pursuant to Section 13 and 15(d)

Debt, Net (Details 3)

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Debt, Net (Details 3) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Carrying Amount    
Debt Instrument [Line Items]    
Long-term debt $ 1,831,139 $ 1,823,909
Carrying Amount | Unsecured Senior Notes    
Debt Instrument [Line Items]    
Long-term debt 1,192,910 1,191,046
Carrying Amount | Other fixed-rate debt    
Debt Instrument [Line Items]    
Long-term debt 144,468 148,308
Carrying Amount | Variable-rate debt    
Debt Instrument [Line Items]    
Long-term debt 493,761 484,555
Estimated Fair Value    
Debt Instrument [Line Items]    
Long-term debt 1,873,310 1,853,206
Estimated Fair Value | Unsecured Senior Notes    
Debt Instrument [Line Items]    
Long-term debt 1,227,441 1,219,603
Estimated Fair Value | Other fixed-rate debt    
Debt Instrument [Line Items]    
Long-term debt 149,907 147,106
Estimated Fair Value | Variable-rate debt    
Debt Instrument [Line Items]    
Long-term debt $ 495,962 $ 486,497