Equity (Reclassification out of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018		Mar. 31, 2017	Jan. 01, 2018	Dec. 31, 2016
New Accounting Pronouncement, Early Adoption [Line Items]
Beginning Balance		$ 63		$ 0
Balance after adjustment		63		0	$ 76	$ 0
Unrealized loss before reclassifications		(176)	[1]	0
Amounts reclassified from accumulated other comprehensive income		0		0
Net current-period other comprehensive income		(176)		0
Ending Balance		$ (100)		$ 0
ASU 2018-02 effect
New Accounting Pronouncement, Early Adoption [Line Items]
Adjustment due to ASU 2018-02	[1]				13
ASU 2018-02 end balance
New Accounting Pronouncement, Early Adoption [Line Items]
Adjustment due to ASU 2018-02						$ 0
Balance after adjustment					$ 76

[1] Due to the implementation of ASU 2018-02, the tax rate changed from 37.75% to 24.5%.