Note 6 - Leases (Details Textual) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Operating Lease, Liability, Total	[1]	$ 66,911
Lessee, Operating Lease, Renewal Term		5 years
Operating Lease, Right-of-Use Asset		$ 65,211		$ 0
Operating Lease, Liability, Noncurrent		50,903		0
Operating Leases, Future Minimum Payments Due, Next Twelve Months				19,800
Operating Leases, Future Minimum Payments, Due in Two Years				15,100
Operating Leases, Future Minimum Payments, Due in Three Years				11,500
Operating Leases, Future Minimum Payments, Due in Four Years				8,100
Operating Leases, Future Minimum Payments, Due in Five Years				5,400
Operating Leases, Future Minimum Payments, Due Thereafter				$ 7,200
Discontinued Operations, Held-for-sale [Member]
Operating Lease, Right-of-Use Asset		2,200
Operating Lease, Liability, Noncurrent		$ 1,100
Minimum [Member]
Lessee, Operating Lease, Remaining Lease Term		1 year
Maximum [Member]
Lessee, Operating Lease, Remaining Lease Term		20 years
Accounting Standards Update 2016-02 [Member]
Operating Lease, Liability, Total			$ 70,500
Operating Lease, Right-of-Use Asset			$ 70,500

[1] Amounts exclude operating lease assets of $2.2 million and other liabilities of $1.1 million that were classified as held for sale at September 30, 2019 (see Note 5).