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Note 9 - Senior Notes, Credit Facilities, Note Payable and Capital Leases (Details Textual)
1 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Apr. 12, 2013
USD ($)
May 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Sep. 30, 2015
Dec. 31, 2014
USD ($)
Dec. 31, 2017
Dec. 31, 2015
USD ($)
Apr. 30, 2013
USD ($)
Revolving Credit Facility [Member]                  
Long-term Line of Credit     $ 0            
Line of Credit Facility, Maximum Borrowing Capacity   $ 100,000,000              
Debt Instrument, Term   3 years              
Letter of Credit [Member] | Minimum [Member]                  
Letter of Credit, Participation Fee, Percent     2.25%            
Letter of Credit [Member] | Maximum [Member]                  
Letter of Credit, Participation Fee, Percent     3.25%            
Letter of Credit [Member]                  
Letter of Credit Outstanding, Fronting Fee     0.20%            
Senior Notes [Member]                  
Debt Instrument, Face Amount $ 500,000,000                
Pension Contributions           $ 6,500,000      
Debt Instrument, Unamortized Discount     $ 6,100,000           $ 10,000,000
Debt Instrument, Interest Rate, Stated Percentage 6.875%                
Interest Expense, Debt     7,900,000 $ 6,600,000          
Interest Costs Capitalized     $ 10,200,000 $ 11,600,000          
Debt Instrument, Redemption Price, Percentage         101.00%        
Subsequent Event [Member]                  
Leverage Ratio             4    
Maximum [Member]                  
Leverage Ratio [1]     5            
Proceeds from Issuance of Senior Long-term Debt $ 490,000,000                
Underwriting Discount On Senior Notes 2.00%                
Letters of Credit Outstanding, Amount     $ 2,600,000            
Capital Lease Obligations     14,690,000         $ 17,600,000  
Capital Lease Obligations, Current     7,761,000         8,735,000  
Capital Lease Obligations, Noncurrent     7,316,000         $ 8,841,000  
Capital Leases, Future Minimum Payments Due     15,351,000            
Capital Leases, Future Minimum Payments, Interest Included in Payments     $ 661,000            
[1] The leverage ratio will decrease to 4.00:1 in 2017.