Leased Assets and Liabilities (Supplemental Cash Flow Information) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Leases [Abstract]
Operating cash outflows - operating leases	$ 10,440	$ 12,319	$ 32,041	$ 33,075
Operating cash outflows - finance leases	172	135	520	378
Financing cash outflows - finance leases	758	630	2,278	1,786
Leased assets obtained in exchange for new lease obligations
Operating leases	3,123	26,134	51,504	33,128
Finance leases	$ 1,124	$ 2,983	$ 3,227	$ 4,143