Leases Future minimum lease payments (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Operating Lease, Right-of-Use Asset	$ 94,646	$ 102,268	$ 0
Current operating lease liabilities	25,730	27,229	0
Long-term operating lease liabilities	70,102	$ 75,276	$ 0
Finance Lease, Right-of-Use Asset	20,849
Lessee, Operating Lease, Lease Not yet Commenced, Amount	57,624
Operating Leases [Member]
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	15,654
Lessee, Operating Lease, Liability, Payments, Due Year Two	25,196
Lessee, Operating Lease, Liability, Payments, Due Year Three	17,301
Lessee, Operating Lease, Liability, Payments, Due Year Four	13,458
Lessee, Operating Lease, Liability, Payments, Due Year Five	11,429
Lessee, Operating Lease, Liability, Payments, Due after Year Five	26,970
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	110,008
Imputed Interest	(14,176)
Lessee, Operating Lease, Liability, Payments, Due	95,832
Operating Lease, Right-of-Use Asset	94,646
Current operating lease liabilities	25,730
Long-term operating lease liabilities	70,102
Finance Leases [Member]
Finance Lease, Liability, Payments, Remainder of Fiscal Year	1,425
Finance Lease, Liability, Payments, Due Year Two	2,895
Finance Lease, Liability, Payments, Due Year Three	2,703
Finance Lease, Liability, Payments, Due Year Four	2,542
Finance Lease, Liability, Payments, Due Year Five	2,309
Finance Lease, Liability, Payments, Due after Year Five	21,600
Finance Lease, Liability, Undiscounted Excess Amount	33,474
Imputed Interest	(13,728)
Finance Lease, Liability, Payment, Due	19,746
Finance Lease, Liability, Current	1,593
Finance Lease, Liability, Noncurrent	$ 18,153