Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2015

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 and 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 2015, 2014, and 2013 is as follows (in thousands, except per share data):

	2015
	Net Income (numerator)		Shares (denominator)	Per Share Amount
Basic EPS	$	73,056	86,974	$	0.84
Effect of restricted stock	—		135
Diluted EPS	$	73,056	87,109	$	0.84

	2014
	Net Income (numerator)		Shares (denominator)	Per Share Amount
Basic EPS	$	84,834	87,748	$	0.97
Effect of restricted stock	—		175
Diluted EPS	$	84,834	87,923	$	0.96

	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