Accounting Pronouncements Recently Issued Narrative - Impact of implementation of new accounting standards (Details) - USD ($) $ in Thousands		9 Months Ended
	Jan. 01, 2020	Sep. 30, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounting Standards Update 2016-02 [Member]
Change in other assets due to adoption of new ASU		$ 49,200
Change in other liabilities due to adoption of new ASU		48,200
Accounting Standards Update 2016-01 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption				$ 0
Accounting Standards Update 2018-15 [Member]
Change in other assets due to adoption of new ASU		$ 920
Retained Earnings [Member] | Accounting Standards Update 2016-02 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption			$ 782
Retained Earnings [Member] | Accounting Standards Update 2016-01 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption				$ (157)
Forecast [Member] | Minimum [Member] | Accounting Standards Update 2016-13 [Member]
Estimated percentage change in allowance for credit losses	(10.00%)
Forecast [Member] | Maximum [Member] | Accounting Standards Update 2016-13 [Member]
Estimated percentage change in allowance for credit losses	5.00%