Leases (Summary of Lease Liability Maturities) (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Operating Lease
Remainder of 2019	$ 16,372
2020	31,314
2021	20,865
2022	13,141
2023	7,601
Thereafter	24,045
Total lease payments	113,338
Less: Imputed interest	(26,174)
Total lease obligations	87,164
Less: Lease obligations held-for-sale	(1,813)
Total lease obligations excluding held-for-sale	85,351
Less: Current portion	(23,797)	$ 0
Total Long-term lease obligations excluding held-for-sale	61,554	0
Finance Leases
Remainder of 2019	1,292
2020	2,610
2021	2,647
2022	2,344
2023	6,974
Thereafter	13,715
Total lease payments	29,582
Less: Imputed interest	(6,801)
Total lease obligations	22,781	$ 23,386
Less: Lease obligations held-for-sale	0
Total lease obligations excluding held-for-sale	22,781
Less: Current portion	(1,309)
Total Long-term lease obligations excluding held-for-sale	$ 21,472