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Organization and Summary of Significant Accounting Policies (Details 8) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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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

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