Note 5 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

(In thousands)	201 7			201 6		201 5
Current:
Federal	$	12,427		$	8,987	$	9,280
State		990			1,125		946
Total current		13,417			10,112		10,226
Deferred:
Federal		(48,424	)		12,427		13,042
State		1,196			1,063		1,678
Total deferred		(47,228	)		13,490		14,720
Total (benefit) expense	$	(33,811	)	$	23,602	$	24,946

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

	201 7			201 6			201 5
Federal statutory income tax rate		35	%		35	%		35	%
Per diem and other non-deductible expenses		4			4			3
Increase in taxes arising from state income taxes, net of federal income tax benefit		3			2			3
Federal tax credits		(1	)		—			—
Decrease in federal deferred taxes due to decrease in statutory rate		(100	)		—			—
Other, net		(1	)		—			—
Effective tax rate		(60	)%		41	%		41	%

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

(In thousands)	201 7		201 6
Deferred tax assets:
Reserves and accrued liabilities	$	7,277	$	8,490
Other		1,965		2,757
		9,242		11,247
Deferred tax liabilities:
Depreciation		107,453		155,936
Prepaid expenses		2,415		3,165
		109,868		159,101
Net deferred tax liability	$	100,626	$	147,854