Restricted Cash (Tables)

3 Months Ended

Mar. 31, 2018

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

Schedule of Cash and Cash Equivalents [Table Text Block]

	March 31,				December 31,
	2018		2017		2017		2016
Cash and cash equivalents	$	92,581	$	90,593	$	89,879	$	88,818
Restricted cash included in other assets		21,105		21,652		21,171		21,883
Cash, cash equivalents and restricted cash	$	113,686	$	112,245	$	111,050	$	110,701