Note 7 - Debt (Details) - Long-term Debt (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Less: Current portion	$ 20,349	$ 30,480
Total long-term debt and capitalized leases	1,146,134	1,279,805
Domestic Term Loan [Member]
Debt Instrument [Line Items]
Long Term Debt	160,000	170,000
Canadian Term Loan [Member]
Debt Instrument [Line Items]
Long Term Debt	0	85,786
6 1/2% Senior Notes [Member]
Debt Instrument [Line Items]
Long Term Debt	600,000	600,000
5 1/8% Senior Notes [Member]
Debt Instrument [Line Items]
Long Term Debt	400,000	400,000
Capital Lease Obligations And Other Debt [Member]
Debt Instrument [Line Items]
Long Term Debt	6,483	6,696
Gross [Member]
Debt Instrument [Line Items]
Long Term Debt	1,166,483	1,310,285
Domestic Line of Credit [Member]
Debt Instrument [Line Items]
Long Term Debt	0	0
Canadian Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long Term Debt	0	0
Australian Credit Facility 2 [Member]
Debt Instrument [Line Items]
Long Term Debt	$ 0	$ 47,803