Note 3 - Fresh Start Accounting - Reconciliation of Enterprise Value to the Estimated Fair Value of Successor Common Stock (Details) $ / shares in Units, $ in Thousands	Jan. 01, 2017 USD ($) $ / shares shares
Enterprise value	$ 750,000
Add: Cash and cash equivalents	181,242
Less: Emergence costs settled in cash post-emergence	(5,378)
Fair value of New Equity and New Warrants, including Rights Offering	925,864
Less: Rights Offering proceeds	(200,000)
Less: Fair value of New Warrants	(20,385)
Fair value of Successor common stock, prior to Rights Offering	$ 705,479
Shares outstanding on January 1, 2017, prior to Rights Offering shares (in shares) | shares	39,999,997
Per share value (in dollars per share) | $ / shares	$ 17.64