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Borrowings (Scheduled Principal Repayments on Borrowings) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Debt Instrument [Line Items] |  |
2016 | $ 437,157 |
2017 | 567,437 |
2018 | 714,423 |
2019 | 339,156 |
2020 | 664,963 |
Thereafter | 1,778,921 |
Total outstanding debt | 4,500,000 | $ 4,499,700
Amortization Other [Member] |  |
Debt Instrument [Line Items] |  |
2016 | 19,016 |
2017 | 4,653 |
2018 | 1,967 |
2019 | (1,462) |
2020 | (2,037) |
Thereafter | (3,468) |
Total outstanding debt | 18,669 |
Maturities |  |
Debt Instrument [Line Items] |  |
2016 | 418,141 |
2017 | 562,784 |
2018 | 712,456 |
2019 | 340,618 |
2020 | 667,000 |
Thereafter | 1,782,389 |
Total outstanding debt | $ 4,483,388 |

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