Accounts Receivable Factoring (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Cash collected on behalf of factor	$ 21,485	$ 14,542
Continuing Involvement with Derecognized Transferred Financial Assets, Amount Outstanding	103,818	100,409
Amount Of Account Receivable Factoring Without Recourse	556,102	626,618
Loss On Sale Of Accounts Receivable Without Recourse	1,007	1,248	$ 1,904
Loss On Sale Of Accounts Receivable With Recourse	$ 0	$ 0	$ 99