Restricted Cash (Tables)

6 Months Ended

Jun. 30, 2018

Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents [Abstract]

Schedule Of Cash And Cash Equivalents [Table Text Block]

	June 30,				December 31,
	2018		2017		2017		2016
Cash and cash equivalents	$	90,220	$	98,821	$	89,879	$	88,818
Restricted cash included in other assets		20,740		21,458		21,171		21,883
Cash, cash equivalents and restricted cash	$	110,960	$	120,279	$	111,050	$	110,701