Quarterly report pursuant to Section 13 or 15(d)

Debt, Net (Details 2)

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Debt, Net (Details 2) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Carrying amount and estimated fair value of debt    
Carrying Value $ 2,121,240 $ 1,920,057
Carrying Amount    
Carrying amount and estimated fair value of debt    
Variable-rate debt 643,249 639,877
Carrying Value 2,121,240 1,920,057
Carrying Amount | Unsecured senior notes    
Carrying amount and estimated fair value of debt    
Fixed-rate debt 1,188,241 890,862
Carrying Amount | Other fixed-rate debt    
Carrying amount and estimated fair value of debt    
Fixed-rate debt 289,750 389,318
Total Estimated Fair Value    
Carrying amount and estimated fair value of debt    
Variable-rate debt 644,243 642,091
Carrying Value 2,154,561 1,900,067
Total Estimated Fair Value | Unsecured senior notes    
Carrying amount and estimated fair value of debt    
Fixed-rate debt 1,212,120 901,599
Total Estimated Fair Value | Other fixed-rate debt    
Carrying amount and estimated fair value of debt    
Fixed-rate debt $ 298,198 $ 356,377