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Fair Value Measurements (Details) $ in Thousands | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Number of domestic regions | 2 |
Fair Value, Inputs, Level 2 [Member] |  |
Assets: |  |
Interest Rate Derivative Assets, at Fair Value | $ 9,501 | $ 9,484
Total | 10,358 | 12,750
Liabilities: |  |
Interest rate derivative financial instruments | 10,579 | 24,411
Total | 10,579 | 24,411
Investments [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets: |  |
Investments, Fair Value Disclosure | 844 | 3,254
Demand Obligation [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets: |  |
Investments, Fair Value Disclosure | $ 13 | $ 12

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