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Investments (Schedule of Noncontroling Interest) (Details) - USD ($) $ in Thousands	3 Months Ended						12 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Noncontrolling Interest [Line Items]
Noncontrolling interest at beginning of period		$ 13,762					$ 13,762
Net income (loss)	$ 100	30	$ (122)	$ 303	$ 576	$ 1,130	130	$ 1,887	$ 2,207
Noncontrolling interest at end of period			13,762					13,762
PST Eletronica Ltda [Member]
Noncontrolling Interest [Line Items]
Noncontrolling interest at beginning of period		$ 13,762				$ 13,310	13,762	13,310	22,550
Net income (loss)							(130)	(1,887)	(2,207)
Foreign currency translation							826	2,339	(7,033)
Comprehensive income (loss) related to noncontrolling interest							696	452	(9,240)
Acquisition of noncontrolling interest							$ (14,458)
Noncontrolling interest at end of period			$ 13,762					$ 13,762	$ 13,310