Accounts Receivable, Net and Significant Balance Sheet Information (Tables)

12 Months Ended

Dec. 31, 2012

Receivables [Abstract]

Schedule of accounts receivable [Table Text Block]

E. Accounts Receivable, Net and Supplemental Balance Sheet Information

The following comprise accounts receivable, net and other:

	December 31,
	2012		2011
Accounts receivable	$	105,044	$	82,076
Receivables under contractual arrangements	12,961		11,194
	118,005		93,270
Less allowances for doubtful accounts	2,442		2,475
	$	115,563	$	90,795

Schedule of other current assets [Table Text Block]

The following items comprise the amounts included in the balance sheet:

	December 31,
Other current assets	2012		2011
Refundable income taxes	$	—	$	2,602
Deferred income taxes	8,815		12,071
Other	2,593		2,247
Total	$	11,408	$	16,920

Schedule of other assets, noncurrent [Table Text Block]

	December 31,
Other assets, noncurrent	2012		2011
Assets invested for self-insurance	$	10,758	$	13,064
Investment--cost-method affiliate	1,168		1,168
Deferred income taxes	1,059		—
Other	1,299		1,737
Total	$	14,284	$	15,969

Schedule of accrued liabilities [Table Text Block]

	December 31,
Accrued expenses	2012		2011
Employee compensation	$	17,888	$	15,046
Accrued compensated absences	7,080		7,138
Self-insured medical claims	2,571		2,950
Customer advances, deposits	1,346		1,321
Income taxes payable	2,013		—
Taxes, other than income	2,463		2,622
Accrued litigation settlement	—		2,900
Other	1,101		2,146
Total	$	34,462	$	34,123

Other liabilities, noncurrent [Table Text Block]

	December 31,
Other liabilities, noncurrent	2012		2011
Pension and retirement plans	$	14,513	$	11,207
Deferred income taxes	—		5,633
Other	3,367		2,525
Total	$	17,880	$	19,365