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Note 9 - Senior Notes, Credit Facility and Capital Leases (Details Textual) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
May 31, 2016
Apr. 12, 2013
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2014
Dec. 31, 2016
Underwriting Discount on Senior Notes   2.00%        
Letters of Credit Outstanding, Amount     $ 2,600      
Capital Lease Obligations     13,288     $ 11,500
Capital Lease Obligations, Current     5,852     5,653
Capital Lease Obligations, Noncurrent     7,436     $ 5,838
Capital Leases, Future Minimum Payments Due     14,101      
Capital Leases, Future Minimum Payments, Interest Included in Payments     813      
Revolving Credit Facility [Member]            
Line of Credit Facility, Maximum Borrowing Capacity $ 100,000          
Debt Instrument, Term 3 years          
Long-term Line of Credit     $ 0      
Letter of Credit [Member]            
Letter of Credit Outstanding, Fronting Fee     0.20%      
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%      
Senior Notes [Member]            
Debt Instrument, Face Amount   $ 500,000        
Payment for Pension Benefits         $ 6,500  
Proceeds from Issuance of Senior Long-term Debt   490,000        
Debt Instrument, Unamortized Discount   $ 10,000 $ 4,600      
Debt Instrument, Interest Rate, Stated Percentage   6.875%        
Interest Expense, Debt     26,300 $ 15,200    
Interest Costs Capitalized     $ 900 $ 12,000    
Debt Instrument, Redemption Price, Percentage     101.00%      
Senior Notes [Member] | Costs Related to Private Offering and Tender Offer [Member]            
Interest Expense, Debt     $ 900