Carrying value of amounts transferred to third parties for security purposes that are expected to be returned or applied towards payment in the future.

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Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Foreign Currency Translation (Details) - USD ($) $ in Thousands			3 Months Ended	12 Months Ended
	Sep. 01, 2015	Feb. 21, 2015	Mar. 31, 2015	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Real Estate [Line Items]
Cumulative foreign currency translation adjustment				$ 500	$ 100	$ 400
Reduction (increase) on the gain on sale				0	0	$ (250)
Deposits Assets				$ 400	$ 3,600
Alte Jakobstrabe
Real Estate [Line Items]
Reduction (increase) on the gain on sale		$ 600	$ 600
Holstenplatz
Real Estate [Line Items]
Reduction (increase) on the gain on sale	$ 400