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Note 6 - Long-Term Debt (Details Textual) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2015
Jun. 17, 2015
Jun. 30, 2015
Jun. 30, 2014
Senior Unsecured Notes Due 2022 [Member]        
Debt Instrument, Date of First Required Payment   Dec. 15, 2015    
Debt Instrument, Date for Company Option to Repurchase Inclusive of Premium for Repurchase   Jun. 15, 2018    
Debt Instrument, Face Amount   $ 450,000    
Debt Instrument, Interest Rate, Stated Percentage   5.75%    
Debt Instrument, Maturity Date   Jun. 15, 2022    
Percentage of Aggregate Principal Amount for Debt Redemption Prior to Repurchase Premium Cutoff Date   100.00%    
Debt Instrument, Maximum Percentage of Redemption Prior to Premium Cutoff Date, Allowable Without Redemption Premium   35.00%    
Percentage of Aggregate Principal Amount for Debt Redemption Prior to the Premium Cutoff Date to be Purchased Without Repdemption Premium   105.75%    
Minimum Percentage of Debt to be held in Order to Declare Notes Payable Immediately in Event of Default   25.00%    
Senior Credit Facility [Member] | Revolving Credit Facility [Member] | JPMorgan Chase Bank [Member]        
Debt Instrument, Term 5 years      
Senior Credit Facility [Member] | Secured Debt [Member] | JPMorgan Chase Bank [Member]        
Debt Instrument, Term 5 years      
Long-term Debt $ 100,000   $ 100,000  
Long Term Debt, Amortization Rate, First Twelve Months 2.50%   2.50%  
Long Term Debt, Amortization Rate, Year Two 5.00%   5.00%  
Long Term Debt, Amortization Rate, Year Three 7.50%   7.50%  
Long Term Debt, Amortization Rate, Year Four 10.00%   10.00%  
Long Term Debt, Amortization Rate, Year Five 15.00%   15.00%  
Senior Credit Facility [Member] | JPMorgan Chase Bank [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]        
Debt Instrument, Basis Spread on Variable Rate 1.50%      
Senior Credit Facility [Member] | JPMorgan Chase Bank [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]        
Debt Instrument, Basis Spread on Variable Rate 2.25%      
Senior Credit Facility [Member] | JPMorgan Chase Bank [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument, Basis Spread on Variable Rate 1.50%      
Senior Credit Facility [Member] | JPMorgan Chase Bank [Member] | Base Rate [Member] | Minimum [Member]        
Debt Instrument, Basis Spread on Variable Rate 0.50%      
Senior Credit Facility [Member] | JPMorgan Chase Bank [Member] | Base Rate [Member] | Maximum [Member]        
Debt Instrument, Basis Spread on Variable Rate 1.25%      
Senior Credit Facility [Member] | JPMorgan Chase Bank [Member] | Base Rate [Member]        
Debt Instrument, Basis Spread on Variable Rate 0.50%      
Senior Credit Facility [Member] | JPMorgan Chase Bank [Member] | Minimum [Member]        
Line of Credit Facility, Commitment Fee Percentage 0.25%      
Senior Credit Facility [Member] | JPMorgan Chase Bank [Member] | Maximum [Member]        
Line of Credit Facility, Commitment Fee Percentage 0.40%      
Senior Credit Facility [Member] | JPMorgan Chase Bank [Member]        
Line of Credit Facility, Maximum Borrowing Capacity $ 200,000   $ 200,000  
Line of Credit Facility, Commitment Fee Percentage 0.25%      
Credit Facility, Maximum Additional Amount Allowable $ 300,000   300,000  
Payments of Dividends   $ 450,000 450,000  
Long-term Debt $ 550,000   $ 550,000