Note 3 - Long-term Debt - Aggregate Minimum Principal Maturities on Long-term Debt (Details) - USD ($) $ in Thousands		Dec. 31, 2016		Dec. 31, 2015
2021		$ 556,438
Thereafter		1,225,000
Total		1,781,438
2014 Senior Credit Facility [Member]
2021	[1]	556,438
Thereafter	[1]
Total		556,438	[1]	$ 556,438
2024 Notes [Member]
2021
Thereafter		525,000
Total		525,000
2026 Notes [Member]
2021
Thereafter		700,000
Total		$ 700,000

[1] Pursuant to the 2017 Senior Credit Facility, the maturity date of the term loan was extended to February 7, 2024.