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Note 9 - Senior Notes, Credit Facilities and Capital Leases (Details Textual)
1 Months Ended 3 Months Ended 12 Months Ended
Apr. 12, 2013
USD ($)
May 31, 2016
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2017
Dec. 31, 2016
USD ($)
Underwriting Discount On Senior Notes 2.00%            
Leverage Ratio             5
Letters of Credit Outstanding, Amount     $ 2,600,000        
Capital Lease Obligations     11,724,000       $ 11,500,000
Capital Lease Obligations, Current     5,647,000       5,653,000
Capital Lease Obligations, Noncurrent     6,088,000       $ 5,838,000
Capital Leases, Future Minimum Payments Due     12,309,000        
Capital Leases, Future Minimum Payments, Interest Included in Payments     $ 585,000        
Maximum [Member]              
Leverage Ratio [1]     4        
Scenario, Forecast [Member]              
Leverage Ratio           4  
Revolving Credit Facility [Member]              
Line of Credit Facility, Maximum Borrowing Capacity   $ 100,000,000          
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 $ 500,000,000            
Payment for Pension Benefits         $ 6,500,000    
Proceeds from Issuance of Senior Long-term Debt 490,000,000            
Debt Instrument, Unamortized Discount $ 10,000,000   $ 5,200,000        
Debt Instrument, Interest Rate, Stated Percentage 6.875%            
Interest Costs Capitalized     8,100,000 $ 5.20      
Interest Expense, Debt     $ 900,000 $ 3,800,000      
Debt Instrument, Redemption Price, Percentage     101.00%        
[1] The leverage ratio was amended for to be 5.00:1 for 2016, and reverted back to 4.00:1 effective January 1, 2017.