Significant Accounting Policies Significant Accounting Policies - AOCI Tax Effects ASU 2018-02 (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stranded Deferred Tax Remeasurement Benefit	$ 0		$ 0	$ 1,366	$ 0
Accounting Standards Update 2018-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Stranded Deferred Tax Remeasurement Benefit		$ 1,400