Income Taxes (Tables)

12 Months Ended

Dec. 31, 2012

Income Tax Disclosure [Abstract]

Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]

Income before income taxes was attributable to the following sources:

	Year Ended December 31,
	2012		2011		2010
United States	$	35,414	$	18,261	$	18,549
Canada	5,244		5,039		5,785
Total	$	40,658	$	23,300	$	24,334

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

The provision for income taxes follows:

	Year Ended December 31,
	2012			2011		2010
Currently payable:
Federal	$	15,853		$	3,065	$	4,051
State	2,239			2,277		1,057
Canadian	1,578			1,565		1,789
Total current	19,670			6,907		6,897
Deferred taxes	(3,607		)	2,328		3,384
Total taxes on income	$	16,063		$	9,235	$	10,281

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

A reconciliation of the expected statutory U.S. federal rate to our actual effective income tax rate follows:

	Year Ended December 31,
	2012		2011		2010
Statutory U.S. federal tax rate	35.0	%	35.0	%	35.0	%
State income taxes, net of federal benefit	3.9		5.1		3.2
Effect of Canadian income taxes	(1.0	)	(1.2	)	(1.0	)
Nondeductible expenses	1.4		2.5		2.0
ESOP dividend deduction	(.7	)	(1.2	)	(1.1	)
U.S. tax benefit of foreign source income	—		(.1	)	(.7	)
Valuation allowance on foreign tax credits	—		(1.1	)	4.2
All other, net	.9		.6		.6
Effective income tax rate	39.5	%	39.6	%	42.2	%

Schedule of Deferred Tax Assets and LIabilities, Current [Table Text Block]

Significant components of our current net deferred tax assets and liabilities at December 31, were as follows:

	December 31,
	2012			2011
Deferred tax assets:
Accrued compensation obligations	$	2,424		$	2,182
Self-insurance accruals	7,083			9,303
Other, net	(498		)	893
	9,009			12,378
Less deferred tax asset valuation allowance	194			307
Net deferred income tax assets--current	$	8,815		$	12,071

Deferred Tax Assets and Liabilities, Noncurrent [Table Text Block]

Significant components of our noncurrent net deferred tax assets and liabilities at December 31, were as follows:

	December 31,
	2012			2011
Deferred tax assets:
Self-insurance accruals	$	14,497		$	10,491
Intangibles	(341		)	424
Accrued expenses and other liabilities	895			700
Accrued stock compensation	1,476			1,395
Defined benefit pension plans	4,698			3,702
Foreign tax credit carryforward	768			768
Other future deductible amounts, net	1,470			1,392
	23,463			18,872
Less deferred tax asset valuation allowance	574			461
	22,889			18,411
Deferred tax liabilities:
Property and equipment	21,830			24,044
	21,830			24,044
Net deferred tax assets--noncurrent	$	1,059
Net deferred tax liabilities--noncurrent				$	5,633

Summary of Income Tax Contingencies [Table Text Block]

The balance of unrecognized benefits and the amount of related interest and penalties at December 31, were as follows:

	December 31,
	2012		2011
Unrecognized tax benefits	$	2,638	$	1,825
Portion, if recognized, would reduce tax expense and effective tax rate	1,933		1,260
Accrued interest on unrecognized tax benefits	142		99
Accrued penalties on unrecognized benefits	—		—

Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]

The changes in our unrecognized tax benefits are summarized in the table below:

	Year Ended December 31,
	2012			2011			2010
Balance, beginning of year	$	1,825		$	1,524		$	2,165
Additions based on tax positions related to the current year	667			279			372
Additions for tax positions of prior years	149			101			1,185
Reductions for tax positions of prior years	(3		)	(61		)	(232		)
Reductions related to settlements with taxing authorities	—			—			(900		)
Lapses in statutes of limitations	—			(18		)	(1,066		)
Balance, end of year	$	2,638		$	1,825		$	1,524