Note 10 - Long-term Debt (Tables)

6 Months Ended

Jun. 30, 2015

Debt Disclosure [Abstract]

Schedule of Debt [Table Text Block]

	December 31,		June 30,
	2014		2015
	(in thousands)
Senior Unsecured Notes Payable (a)	$	250,000	$	500,000
Senior Secured Revolving Credit Facility, Bank of America, N.A. (b)		143,853		—
Working capital facilities, Barclays (c)		40,396		41,730
		434,249		541,730
Less current portion		40,396		—
	$	393,853	$	541,730

Schedule of Guarantor Obligations [Table Text Block]

Pricing Tier	Consolidated Senior Secured Leverage Ratio					Commitment Fee/Unused Line Fee			Letter of Credit Fee			Eurocurrency Rate Loans			Base Rate Loans
1	≥	4.00	to 1.0				0.45	%		2.75	%		2.75	%		1.75	%
2	≥	3.50	to 1.0 but <	4.00	to 1.0		0.40	%		2.50	%		2.50	%		1.50	%
3	≥	3.00	to 1.0 but <	3.50	to 1.0		0.35	%		2.25	%		2.25	%		1.25	%
4	≥	2.50	to 1.0 but <	3.00	to 1.0		0.30	%		2.00	%		2.00	%		1.00	%
5			<	2.50	to 1.0		0.30	%		1.75	%		1.75	%		0.75	%

Schedule of Maturities of Long-term Debt [Table Text Block]

	Amount
Six months ended December 31, 2015	$	—
Year ended December 31:
2016		—
2017		—
2018		41,730
2019		—
Thereafter		500,000
Total	$	541,730