Annual report pursuant to Section 13 and 15(d)

Significant Accounting Policies (Narrative) (Details)

v3.3.1.900
Significant Accounting Policies (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Significant Accounting Policies [Line Items]      
DeferredTaxAssetsReclassification $ 29,400,000    
Noncash or Part Noncash Acquisition, Fixed Assets Acquired 3,552,000 $ 0 $ 0
Stock Repurchase Program, Authorized Amount 200,000,000    
Debt and Capital Lease Obligations 133,805,000 155,714,000  
Depreciation expenses including capital leases 164,800,000 145,800,000 126,400,000
Self-insurance reserve 119,200,000 107,700,000  
Long-term portions of self insurance reserve 74,300,000 65,400,000  
Advertising expense 22,900,000 19,300,000 $ 16,700,000
Long-term Debt, Fair Value $ 139,100,000 $ 165,500,000  
Total Stock Repurchased And Retired Shares 1,753,039    
Total Stock Repurchased And Retired Value $ 119,600,000    
Stock Repurchase Program, Remaining Authorized Repurchase Amount 80,400,000    
Group Health Claims [Member]      
Significant Accounting Policies [Line Items]      
Insurance maximum, per occurrence 500,000    
Self insurance additional coverage 400,000    
Workers Compensation Claims [Member]      
Significant Accounting Policies [Line Items]      
Insurance maximum, per occurrence 1,000,000    
Cargo Loss And Damage Claims [Member]      
Significant Accounting Policies [Line Items]      
Insurance maximum, per occurrence 100,000    
Bodily Injury And Property Damage [Member]      
Significant Accounting Policies [Line Items]      
Insurance maximum, per occurrence $ 2,750,000