Note 2 - Long-term Debt (Detail) - Long-term debt (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Long-term debt including current portion:
Total long-term debt including current portion at liquidation value	$ 835,000	$ 835,000
Total long-term debt at recorded value	832,936	832,867
Senior Credit Facility 2012 [Member]
Long-term debt including current portion:
2012 Senior Credit Facility	535,000	535,000
Borrowing availability under the 2012 Senior Credit Facility	40,000	40,000
2020 Notes [Member]
Long-term debt including current portion:
2020 Notes	300,000	300,000
Less unamortized discount on our 2020 Notes	$ (2,064)	$ (2,133)