Accounts Receivable, Net and Supplemental Balance-Sheet Information (Tables)

6 Months Ended

Jun. 30, 2018

Accounts Receivable, Net and Supplemental Balance-Sheet Information [Abstract] [Abstract]

Accounts receivable, net [Table Text Block]

Accounts receivable, net, consisted of the following:

Accounts receivable, net	June 30, 2018		December 31, 2017
Accounts receivable	$	135,920	$	143,244
Receivables under contractual arrangements	46,613		29,895
	182,533		173,139
Less allowances for doubtful accounts	4,264		4,468
Accounts receivable, net	$	178,269	$	168,671

Schedule of Other Current Assets [Table Text Block]

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

Other current assets	June 30, 2018		December 31, 2017
Refundable income taxes	$	—	$	587
Prepaid expense	11,938		15,893
Other	388		784
Total	$	12,326	$	17,264

Accrued expenses [Table Text Block]

Accrued expenses	June 30, 2018		December 31, 2017
Employee compensation	$	17,267	$	20,794
Accrued compensated absences	9,959		9,267
Self-insured medical claims	4,666		3,193
Income tax payable	2,610		3,443
Customer advances, deposits	498		1,672
Taxes, other than income	3,099		2,279
Other	2,413		2,168
Total	$	40,512	$	42,816

Other current liabilities [Table Text Block]

Other current liabilities	June 30, 2018		December 31, 2017
Note payable	$	—	$	149
Current portion of:
Long-term debt	9,944		16,817
Self-insurance accruals	24,015		23,782
Total	$	33,959	$	40,748