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Note 2 - Significant Accounting Policies (Details Textual) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
May. 31, 2013
Dec. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Computer Software, Intangible Asset [Member]          
Interest Costs Capitalized     $ 972,000    
Finite-Lived Intangible Asset, Useful Life     15 years    
Amortization of Intangible Assets     $ 3,300,000 $ 3,200,000 $ 3,000,000
Vehicles [Member]          
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Other Property, Plant, and Equipment, Net   $ 81,200,000 81,200,000    
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Property, Plant, and Equipment Other, Accumulated Depreciation   24,500,000 24,500,000    
Former Chairman [Member]          
Pension and Other Postretirement Benefit Expense $ 10,800,000        
Interest Rate Swap [Member] | Cash Flow Hedging [Member]          
Derivative Asset, Notional Amount       20,900,000  
December 31, 2014 [Member] | Reclassification from Current Deferred Tax Assets to Noncurrent Deferred Tax Assets, Current Asset Decrease [Member]          
Prior Period Reclassification Adjustment   18,400,000      
December 31, 2014 [Member] | Reclassification from Current Deferred Tax Assets to Noncurrent Deferred Tax Assets, Noncurrent Liability Decrease [Member]          
Prior Period Reclassification Adjustment   18,400,000      
Finite-Lived Intangible Assets, Amortization Expense, Year Two   3,200,000 3,200,000    
Finite-Lived Intangible Assets, Amortization Expense, Year Three   3,200,000 3,200,000    
Finite-Lived Intangible Assets, Amortization Expense, Year Four   3,200,000 3,200,000    
Finite-Lived Intangible Assets, Amortization Expense, Year Five   3,200,000 3,200,000    
Goodwill and Intangible Asset Impairment   0      
New Accounting Pronouncement or Change in Accounting Principle, Effect of Change on Operating Results   0      
Depreciation     131,800,000 115,300,000  
Amortization     13,100,000 11,200,000  
Capitalized Computer Software, Net   36,100,000 36,100,000 38,500,000  
Capitalized Computer Software, Accumulated Amortization   13,400,000 13,400,000 10,300,000  
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months   3,200,000 3,200,000    
Indefinite-Lived Franchise Rights   $ 7,900,000 7,900,000 7,000,000  
Advertising Expense     $ 8,800,000 $ 8,700,000 $ 6,800,000