Recent Accounting Pronouncements (Narrative) (Details) $ in Thousands	6 Months Ended
Jun. 30, 2018 USD ($)
Recent Accounting Pronouncements Narrative
Income tax effects from accumulated other comprehensive income to retained earnings	$ 2,717

Impact of effective tax rate change on deferred income tax assets and liabilities.

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration