Leases (Summary of Lease Liability Maturities) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Operating Lease
Remainder of 2019	$ 25,720
2020	30,905
2021	19,989
2022	12,735
2023	7,527
Thereafter	25,167
Total lease payments	122,043
Less: Imputed interest	(28,695)
Total lease obligations	93,348
Less: Lease obligations held-for-sale	(2,991)
Total lease obligations excluding held-for-sale	90,357
Less: Current portion	(24,670)	$ 0
Total Long-term lease obligations excluding held-for-sale	65,687	0
Finance Leases
Remainder of 2019	1,932
2020	2,610
2021	2,647
2022	2,344
2023	6,974
Thereafter	13,715
Total lease payments	30,222
Less: Imputed interest	(7,132)
Total lease obligations	23,090	$ 23,386
Less: Lease obligations held-for-sale	0
Total lease obligations excluding held-for-sale	23,090
Less: Current portion	(1,280)
Total Long-term lease obligations excluding held-for-sale	$ 21,810