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Organization and Summary of Significant Accounting Policies - Financial Instruments (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
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Carrying Amount |  |
Summary of the fair value and carrying value of debt |  |
Total debt | $ 1,562,542 | $ 1,576,882
Carrying Amount | Fixed rate debt |  |
Summary of the fair value and carrying value of debt |  |
Total debt | 682,019 | 680,484
Carrying Amount | Floating rate debt |  |
Summary of the fair value and carrying value of debt |  |
Total debt | 880,523 | 896,398
Fair Value |  |
Summary of the fair value and carrying value of debt |  |
Total debt | 1,507,000 | 1,421,000
Fair Value | Fixed rate debt |  |
Summary of the fair value and carrying value of debt |  |
Total debt | 626,000 | 524,000
Fair Value | Floating rate debt |  |
Summary of the fair value and carrying value of debt |  |
Total debt | $ 881,000 | $ 897,000

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