Leases Future minimum lease payments (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Operating Lease, Right-of-Use Asset	$ 87,849	$ 102,268	$ 0
Current operating lease liabilities	24,004	27,229	0
Long-term operating lease liabilities	64,102	$ 75,276	$ 0
Finance Lease, Right-of-Use Asset	20,089
Lessee, Operating Lease, Lease Not yet Commenced, Amount	56,975
Operating Leases [Member]
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	7,683
Lessee, Operating Lease, Liability, Payments, Due Year Two	25,098
Lessee, Operating Lease, Liability, Payments, Due Year Three	17,388
Lessee, Operating Lease, Liability, Payments, Due Year Four	13,406
Lessee, Operating Lease, Liability, Payments, Due Year Five	11,282
Lessee, Operating Lease, Liability, Payments, Due after Year Five	25,913
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	100,770
Imputed Interest	(12,664)
Lessee, Operating Lease, Liability, Payments, Due	88,106
Operating Lease, Right-of-Use Asset	87,849
Current operating lease liabilities	24,004
Long-term operating lease liabilities	64,102
Finance Leases [Member]
Finance Lease, Liability, Payments, Remainder of Fiscal Year	696
Finance Lease, Liability, Payments, Due Year Two	2,870
Finance Lease, Liability, Payments, Due Year Three	2,679
Finance Lease, Liability, Payments, Due Year Four	2,518
Finance Lease, Liability, Payments, Due Year Five	2,294
Finance Lease, Liability, Payments, Due after Year Five	21,056
Finance Lease, Liability, Undiscounted Excess Amount	32,113
Imputed Interest	(13,196)
Finance Lease, Liability, Payment, Due	18,917
Finance Lease, Liability, Current	2,050
Finance Lease, Liability, Noncurrent	$ 16,867