Additional Financial Information (Tables)

3 Months Ended

Mar. 31, 2019

Additional Financial Information [Abstract]

Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]

	March 31,				December 31,
Cash and Cash Equivalents and Restricted Cash		2019		2018		2018		2017
Cash and cash equivalents	$	6,516	$	48,872	$	5,204	$	50,498
Restricted cash in Other current assets		20		8		61		6
Restricted cash in Other Assets		94		345		135		428
Cash and cash equivalents and restricted cash	$	6,630	$	49,225	$	5,400	$	50,932

	Three months ended
	March 31,
Cash Paid for Amounts Included in the Measurement of Lease Liabilities:	2019		2018
Operating cash flows from operating leases	$	1,332	$	1,207

	Three months ended
	March 31,
Cash Paid (Received) During the Period for:		2019		2018
Interest	$	2,507	$	2,408
Income taxes, net of refunds		(379)		(1,089)