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Organization and Summary of Significant Accounting Policies - Financial Instruments (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
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Carrying Amount |  |
Summary of the fair value and carrying value of debt |  |
Total debt | $ 1,442,652 | $ 1,441,724
Carrying Amount | Fixed rate debt |  |
Summary of the fair value and carrying value of debt |  |
Total debt | 685,152 | 683,577
Carrying Amount | Floating rate debt |  |
Summary of the fair value and carrying value of debt |  |
Total debt | 757,500 | 758,147
Fair Value |  |
Summary of the fair value and carrying value of debt |  |
Total debt | 1,458,000 | 1,445,000
Fair Value | Fixed rate debt |  |
Summary of the fair value and carrying value of debt |  |
Total debt | 699,000 | 686,000
Fair Value | Floating rate debt |  |
Summary of the fair value and carrying value of debt |  |
Total debt | $ 759,000 | $ 759,000

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