Note 6 - Leases (Tables)

3 Months Ended

Mar. 31, 2020

Notes Tables

Lease, Cost [Table Text Block]

	Quarter Ended March 31,
	2020		2019
Operating lease cost	$	5,206	$	5,452
Short-term lease cost		6,081		7,239
Total lease cost	$	11,287	$	12,691

Lease, Supplemental Financial Statement Disclosures, Balance Sheet [Table Text Block]

	March 31, 2020(1)			December 31, 2019(2)
Operating leases:
Operating lease assets	$	68,718		$	71,466
Accrued expenses	$	14,532		$	15,828
Other liabilities		54,985			56,253
Total operating lease liabilities	$	69,517		$	72,081
Weighted-average remaining lease term (in years)		6.07			5.74
Weighted-average discount rate		5.61	%		5.71	%