Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2016

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 2016, 2015, and 2014 is as follows (in thousands, except per share data):

	2016
	Net Income (numerator)		Shares (denominator)		Per Share Amount
Basic EPS	$	56,386	$	83,297	$	0.68
Effect of restricted stock	—		68
Diluted EPS	$	56,386	$	83,365	$	0.68

	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