Note 2 - Significant Accounting Policies (Details Textual) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Depreciation		$ 140,600,000	$ 131,800,000
Amortization		17,000,000	13,100,000
Capitalized Computer Software, Net	$ 33,000,000	33,000,000	36,100,000
Capitalized Computer Software, Accumulated Amortization	16,500,000	16,500,000	13,400,000
Indefinite-Lived Franchise Rights	7,000,000	7,000,000	7,900,000
Advertising Expense		6,800,000	8,800,000	$ 8,700,000
Goodwill, Impairment Loss	0
Franchise Rights [Member]
Finite-Lived Intangible Assets, Amortization Expense, Year Two	3,400,000	3,400,000
Interest Rate Swap [Member] | Cash Flow Hedging [Member]
Derivative Asset, Notional Amount	0	0	0
Vehicles [Member]
Depreciation		106,300,000	101,100,000
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Other Property, Plant, and Equipment, Net	81,500,000	81,500,000
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Property, Plant, and Equipment Other, Accumulated Depreciation	28,700,000	28,700,000
Computer Software, Intangible Asset [Member]
Interest Costs Capitalized		$ 353,000
Finite-Lived Intangible Asset, Useful Life		15 years
Amortization of Intangible Assets		$ 3,400,000	$ 3,300,000	$ 3,200,000
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	3,400,000	3,400,000
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	0
Finite-Lived Intangible Assets, Amortization Expense, Year Three	3,400,000	3,400,000
Finite-Lived Intangible Assets, Amortization Expense, Year Four	3,400,000	3,400,000
Finite-Lived Intangible Assets, Amortization Expense, Year Five	$ 3,400,000	$ 3,400,000