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Fair Value Measurements (Details) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Number of domestic regions | 2 |
Assets: |  |
Interest Rate Derivative Assets, at Fair Value | $ 31,000 |
Total | 4,397,000 | $ 32,587,000
Liabilities: |  |
Interest rate derivative financial instruments | 31,153,000 | 28,653,000
Total | 31,153,000 | 28,653,000
Fair Value, Inputs, Level 1 [Member] |  |
Assets: |  |
Interest Rate Derivative Assets, at Fair Value | 0 |
Total | 0 | 0
Liabilities: |  |
Interest rate derivative financial instruments | 0 | 0
Total | 0 | 0
Level 2 [Member] |  |
Assets: |  |
Interest Rate Derivative Assets, at Fair Value | 31,000 |
Total | 4,397,000 | 32,587,000
Liabilities: |  |
Interest rate derivative financial instruments | 31,153,000 | 28,653,000
Total | 31,153,000 | 28,653,000
Investments [Member] |  |
Assets: |  |
Investments, Fair Value Disclosure | 4,235,000 | 12,283,000
Investments [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets: |  |
Investments, Fair Value Disclosure | 0 | 0
Investments [Member] | Level 2 [Member] |  |
Assets: |  |
Investments, Fair Value Disclosure | 4,235,000 | 12,283,000
Demand Obligation [Member] |  |
Assets: |  |
Investments, Fair Value Disclosure | 131,000 | 20,304,000
Demand Obligation [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Assets: |  |
Investments, Fair Value Disclosure | 0 | 0
Demand Obligation [Member] | Level 2 [Member] |  |
Assets: |  |
Investments, Fair Value Disclosure | $ 131,000 | $ 20,304,000

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