Note 3 - Liquidity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended
	Apr. 12, 2017	Jan. 06, 2017	Mar. 31, 2017	May 04, 2017	May 03, 2017	Dec. 31, 2016	Jul. 20, 2016
Cash and Cash Equivalents, at Carrying Value			$ 115,118			$ 181,242
Plan of Reorganization, Value of Equity Securities Issued or to Be Issued		$ 200,000					$ 200,000
Proceeds from Issuance of Common Stock			0
Subsequent Event [Member]
Cash and Cash Equivalents, at Carrying Value					$ 300,000
Common Stock [Member] | Subsequent Event [Member]
Stock Issued During Period, Shares, New Issues	8,050,000
Share Price	$ 32.50
Common Stock Offered By Company [Member] | Subsequent Event [Member]
Stock Issued During Period, Shares, New Issues	7,050,000
Common Stock Offered By Selling Stockholders [Member] | Subsequent Event [Member]
Stock Issued During Period, Shares, New Issues	1,000,000
Proceeds from Issuance of Common Stock	$ 216,200
PNC Bank, National Association [Member] | New Credit Facility [Member]
Line of Credit Facility, Remaining Borrowing Capacity			63,400
Long-term Line of Credit			$ 0
PNC Bank, National Association [Member] | New Credit Facility [Member] | Subsequent Event [Member]
Letters of Credit Outstanding, Amount				$ 20,600
DIP Lenders [Member] | Superpriority Secured Delayed Draw Term Loan Facility [Member]
Repayments of Debtor-in-Possession Borrowings		$ 25,000