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Recent Accounting Pronouncements Recent Accounting Pronouncements (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Gain on change in fair value of equity and perpetual preferred securities	$ 180
Reclassification from AOCI to retained earnings	0
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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