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Recent Accounting Pronouncements Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Gain on change in fair value of equity and perpetual preferred securities | $ 592 | $ 772
Reclassification from AOCI to retained earnings |  | 0
Accounting Standards Update 2016-01 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Reclassification from AOCI to retained earnings |  | 2,700
Accumulated Other Comprehensive Income (Loss) |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Reclassification from AOCI to retained earnings |  | 2,657
Accumulated Other Comprehensive Income (Loss) | Accounting Standards Update 2016-01 |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Reclassification from AOCI to retained earnings |  | $ 2,657

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