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Fair Value of Derivatives and Financial Instruments (Textual) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Derivative |  |  |
Preferred Stock, Redemption Price Per Share | $ 50.00 |  |
Preferred Stock, Redemption Date | Oct. 01, 2026 |  |
Net liability position |  |  |
Derivative |  |  |
Credit risk related contingent features termination value | $ 1,200 |  |
Designated as Hedging Instrument | Interest Expense |  |  |
Derivative |  |  |
Change in fair value of interest rate derivatives included in AOCI and expected to be reclassified in the next 12 months | 1,900 |  |
Parent Company [Member] |  |  |
Derivative |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | 233 | $ 0 |
Fixed Rate Debt |  |  |
Derivative |  |  |
Notes Payable Excluding Interest Rate Swaps and Cap Agreements | 3,100,000 |  | $ 3,200,000
Notes Payable, Fair Value Disclosure | 3,200,000 |  | 3,300,000
Floating Rate Debt [Member] |  |  |
Derivative |  |  |
Notes Payable Excluding Interest Rate Swaps and Cap Agreements | 1,400,000 |  | 1,300,000
Notes Payable, Fair Value Disclosure | $ 1,400,000 |  | 1,300,000
Minimum [Member] | Conventional Variable Rate Debt [Member] |  |  |
Derivative |  |  |
Debt Renewal Period | 30 days |  |
Maximum [Member] | Conventional Variable Rate Debt [Member] |  |  |
Derivative |  |  |
Debt Renewal Period | 90 days |  |
Fair Value, Measurements, Recurring [Member] |  |  |
Derivative |  |  |
Embedded Derivative, Fair Value of Embedded Derivative Asset | $ 18,500 |  | 21,200
Interest Rate Derivative Assets, at Fair Value | 5,100 |  | 3,600
Interest Rate Derivative Liabilities, at Fair Value | $ 1,600 |  | $ 1,300

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