Note 6 - Leases (Details Textual) - USD ($)		6 Months Ended
		Jun. 30, 2019	Jan. 01, 2019	Dec. 31, 2018
Operating Lease, Right-of-Use Asset		$ 69,057,000		$ 0
Operating Lease, Liability, Total	[1]	$ 69,100,000
Lessee, Operating Lease, Renewal Term		5 years
Operating Lease, Liability, Current	[1]	$ 15,361,000
Operating Lease, Liability, Noncurrent		53,739,000		0
Operating Leases, Future Minimum Payments Due, Next Twelve Months				19,800,000
Operating Leases, Future Minimum Payments, Due in Two Years				15,100,000
Operating Leases, Future Minimum Payments, Due in Three Years				11,500,000
Operating Leases, Future Minimum Payments, Due in Four Years				8,100,000
Operating Leases, Future Minimum Payments, Due in Five Years				5,400,000
Operating Leases, Future Minimum Payments, Due Thereafter				$ 7,200,000
Discontinued Operations, Held-for-sale [Member]
Operating Lease, Right-of-Use Asset		800,000
Operating Lease, Liability, Current		900,000
Operating Lease, Liability, Noncurrent		$ 400,000
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, Right-of-Use Asset			$ 70,500,000
Operating Lease, Liability, Total			$ 70,500,000

[1] Amounts exclude operating lease assets of $0.8 million, accrued expenses of $0.9 million, and other liabilities of $0.4 million that were classified as held for sale at June 30, 2019 (see Note 5).