Unaudited Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 3,487	$ (26)	$ 3,929	$ (2,142)
Other comprehensive income (loss):
Unrealized (loss) gain on available-for-sale securities	47	18	(323)	73
Benefit plan adjustments	0	0	0	1,139
SERP liability adjustments	0	0	0	487
Unrealized gain on interest rate swap	449	95	2,305	217
Other comprehensive income before taxes	496	113	1,982	1,916
Provision for income taxes related to other comprehensive income items	(104)	(40)	(416)	(771)
Other comprehensive income	392	73	1,566	1,145
Comprehensive income (loss)	3,879	47	5,495	(997)
Comprehensive loss attributable to non-controlling interests	(1)	(4)	(19)	(42)
Comprehensive income (loss) attributable to common stockholders	$ 3,880	$ 51	$ 5,514	$ (955)