Fair Value Measurements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Marketable Securities, Current	$ 6	$ 9
APC Technology Segment | Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	5,000	3,451	$ 7,144
Impairment Losses	(2,965)	(2,074)	(1,425)
APC Technology Segment | Fair Value, Measurements, Nonrecurring | Building
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	5,000
Impairment Losses	(2,965)
APC Technology Segment | Fair Value, Measurements, Nonrecurring | Other intangible assets, net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value		3,451	7,144
Impairment Losses		(2,074)	(1,425)
APC Technology Segment | Fair Value, Measurements, Nonrecurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0	0
APC Technology Segment | Fair Value, Measurements, Nonrecurring | Level 1 | Building
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0
APC Technology Segment | Fair Value, Measurements, Nonrecurring | Level 1 | Other intangible assets, net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value		0	0
APC Technology Segment | Fair Value, Measurements, Nonrecurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0	0	0
APC Technology Segment | Fair Value, Measurements, Nonrecurring | Level 2 | Building
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	0
APC Technology Segment | Fair Value, Measurements, Nonrecurring | Level 2 | Other intangible assets, net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value		0	0
APC Technology Segment | Fair Value, Measurements, Nonrecurring | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	7,965	5,525	8,569
APC Technology Segment | Fair Value, Measurements, Nonrecurring | Level 3 | Building
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value	$ 7,965
APC Technology Segment | Fair Value, Measurements, Nonrecurring | Level 3 | Other intangible assets, net
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value		$ 5,525	$ 8,569