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Organization and Summary of Significant Accounting Policies - Financial Instruments (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
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Carrying Amount |  |
Summary of the fair value and carrying value of debt |  |
Total debt | $ 1,436,357 | $ 1,441,724
Carrying Amount | Fixed rate debt |  |
Summary of the fair value and carrying value of debt |  |
Total debt | 684,357 | 683,577
Carrying Amount | Floating rate debt |  |
Summary of the fair value and carrying value of debt |  |
Total debt | 752,000 | 758,147
Fair Value |  |
Summary of the fair value and carrying value of debt |  |
Total debt | 1,452,000 | 1,445,000
Fair Value | Fixed rate debt |  |
Summary of the fair value and carrying value of debt |  |
Total debt | 698,000 | 686,000
Fair Value | Floating rate debt |  |
Summary of the fair value and carrying value of debt |  |
Total debt | $ 754,000 | $ 759,000

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