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Segment Information - Operations and Identifiable Assets (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) segment	Dec. 31, 2019 USD ($)	Jun. 30, 2020 USD ($) customer
Operations and identifiable assets by industry segment
Number of identifiable industry segments | segment			3
Total revenues	$ 276,009	$ 305,342	$ 530,917	$ 596,194
Income (loss) from operations	32,358	32,919	49,051	57,806
Segments assets	1,300,803		1,300,803		$ 1,268,541
Accounts receivable | Customer Concentration Risk
Operations and identifiable assets by industry segment
Number of major customers | customer					1
Concentration (as a percent)					13.00%
Operating Segments | Security Division
Operations and identifiable assets by industry segment
Total revenues	145,236	202,437	280,011	391,401
Income (loss) from operations	19,776	28,562	28,682	48,880
Segments assets	756,457		756,457		$ 758,054
Operating Segments | Healthcare Division
Operations and identifiable assets by industry segment
Total revenues	54,895	41,992	106,398	82,200
Income (loss) from operations	9,323	1,294	18,307	4,111
Segments assets	211,264		211,264		208,857
Operating Segments | Optoelectronics and Manufacturing Division
Operations and identifiable assets by industry segment
Total revenues	87,521	72,806	167,435	146,444
Income (loss) from operations	10,414	9,018	19,154	17,787
Segments assets	257,142		257,142		232,408
Corporate
Operations and identifiable assets by industry segment
Income (loss) from operations	(7,361)	(6,080)	(16,817)	(13,417)
Segments assets	114,816		114,816		109,178
Eliminations
Operations and identifiable assets by industry segment
Total revenues	(11,643)	(11,893)	(22,927)	(23,851)
Income (loss) from operations	206	$ 125	(275)	$ 445
Segments assets	$ (38,876)		$ (38,876)		$ (39,956)

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