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Fair Value Measurements (Details) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
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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 | $ 9,484,000 | $ 31,000
Total | 12,750,000 | 4,397,000
Liabilities: |  |
Interest rate derivative financial instruments | 24,411,000 | 31,153,000
Total | 24,411,000 | 31,153,000
Investments [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets: |  |
Investments, Fair Value Disclosure | 3,254,000 | 4,235,000
Demand Obligation [Member] | Fair Value, Inputs, Level 2 [Member] |  |
Assets: |  |
Investments, Fair Value Disclosure | $ 12,000 | $ 131,000

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