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Organization and Summary of Significant Accounting Policies (Details 8) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Carrying Amount    
Summary of the fair value and carrying value of debt    
Total debt $ 1,588,465 $ 2,025,795
Carrying Amount | Fixed rate debt    
Summary of the fair value and carrying value of debt    
Total debt 691,465 1,040,295
Carrying Amount | Floating rate debt    
Summary of the fair value and carrying value of debt    
Total debt 897,000 985,500
Fair Value    
Summary of the fair value and carrying value of debt    
Total debt 1,421,000 1,946,000
Fair Value | Fixed rate debt    
Summary of the fair value and carrying value of debt    
Total debt 524,000 960,000
Fair Value | Floating rate debt    
Summary of the fair value and carrying value of debt    
Total debt $ 897,000 $ 986,000