Summary of Significant Accounting Policies, Other Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Other Assets [Abstract]
Deferred taxes	$ 37,332	$ 33,785
Deposits for noncancelable operating leases	41,986	43,375
Cash surrender value for life insurance policies	35,590	37,737
Other	29,204	49,998
Total other assets	$ 144,112	$ 164,895