Other Income, Net of Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Other Income, Net of Expenses [Abstract]
Interest income	$ 295	$ 239	$ 569	$ 453
Gain (loss) on investments	49	34	198	(69)
Insurance recovery	0	635	0	635
Other	28	144	72	494
Total	$ 372	$ 1,052	$ 839	$ 1,513