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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

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