Note 2 - Long-term Debt (Detail) - Long-term debt summary (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Long-term debt including current portion:
Total long-term debt including current portion at liquidation value	$ 835,000	$ 836,968
Total long-term debt at recorded value	832,867	832,233
Borrowing availability under our senior credit facility	40,000	31,000
2012 Senior Credit Facility [Member]
Long-term debt including current portion:
2012 Senior Credit Facility	535,000
Total long-term debt including current portion at liquidation value	535,000
2007 Senior Credit Facility [Member]
Long-term debt including current portion:
Secured Debt		471,968
2020 Notes [Member]
Long-term debt including current portion:
Total long-term debt including current portion at liquidation value	300,000
Less unamortized discount	(2,133)
2020 Notes	300,000
2015 Notes [Member]
Long-term debt including current portion:
Secured Debt		365,000
Less unamortized discount	$ 3,700	$ (4,735)