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Derivatives (Narrative) (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) item | Jun. 30, 2018 USD ($) item | Dec. 31, 2017 USD ($)
Derivative [Line Items] |  |  |
Notional amount of derivatives | $ 2,949,325 | $ 2,949,325 | $ 2,799,296
Derivatives Designated as Hedging Instruments [Member] |  |  |
Derivative [Line Items] |  |  |
Notional amount of derivatives | 1,358,110 | 1,358,110 | 1,358,110
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] |  |  |
Derivative [Line Items] |  |  |
Notional amount of derivatives | 875,000 | 875,000 | 875,000
Termination fees |  | 10,600 |
Amortization of accumulated other comprehensive loss on terminated cash flow hedges | $ 1,500 | $ 2,500 |
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Swap Agreement One To Five [Member] |  |  |
Derivative [Line Items] |  |  |
Number of interest rate swap agreements | item | 5 | 5 |
Number of interest rate swap terminated | item |  | 5 |
Notional amount of derivatives | $ 450,000 | $ 450,000 |
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Date One [Member] | $300 Million Swap Agreement [Member] |  |  |
Derivative [Line Items] |  |  |
Notional amount of derivatives | 425,000 | $ 425,000 |
Derivative maturity expiration year |  | 2022 |
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Date Two [Member] | $200 Million Swap Agreement [Member] |  |  |
Derivative [Line Items] |  |  |
Notional amount of derivatives | 350,000 | $ 350,000 |
Derivative maturity expiration year |  | 2023 |
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Cash Flow Hedge [Member] | Date Three [Member] | Swap Agreement 3, Expires 2024 [Member] |  |  |
Derivative [Line Items] |  |  |
Notional amount of derivatives | 100,000 | $ 100,000 |
Derivative maturity expiration year |  | 2024 |
Interest Rate Swaps [Member] | Derivatives Designated as Hedging Instruments [Member] | Fair Value Hedging [Member] |  |  |
Derivative [Line Items] |  |  |
Notional amount of derivatives | $ 483,110 | $ 483,110 | $ 483,110

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