Investments Gross realized gains and losses (Tables)

6 Months Ended

Jun. 30, 2018

Gain (Loss) on Securities [Line Items]

Schedule of Realized Gain (Loss) [Table Text Block]

(in thousands)	Three months ended June 30,						Six months ended June 30,
	2018			2017			2018			2017
Gross realized gains	$	133		$	—		$	398		$	—
Gross realized losses	(1		)	(1		)	(1		)	(1		)
Net realized gains (losses)	$	132		$	(1	)	$	397		$	(1	)