Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2013

Significant Accounting Policies [Abstract]

Property, Plant and Equipment [Table Text Block]

Lives of the assets are as follows:
	Years
Land improvements and buildings	5-30
Leasehold improvements	5-25
Furniture and fixtures	3-5
Shop & service equipment	3-10
Revenue equipment	5-7

Schedule of Calculation of Numerator and Denominator in Earnings Per Share [Table Text Block]

A reconciliation of the numerator (net income) and denominator (weighted average number of shares outstanding of the basic and diluted earnings per share ("EPS") for 2013, 2012, and 2011 is as follows (in thousands, except per share data):

	2013
	Net Income (numerator)		Shares (denominator)	Per Share Amount
Basic EPS	$	70,582	85,209	$	0.83
Effect of restricted stock	—		232
Diluted EPS	$	70,582	85,441	$	0.83

	2012
	Net Income (numerator)		Shares (denominator)	Per Share Amount
Basic EPS	$	61,541	85,892	$	0.72
Effect of restricted stock	—		309
Diluted EPS	$	61,541	86,201	$	0.71

	2011
	Net Income (numerator)		Shares (denominator)	Per Share Amount
Basic EPS	$	69,932	89,656	$	0.78
Effect of restricted stock	—		17
Diluted EPS	$	69,932	89,673	$	0.78