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Investments (Schedule of Noncontrolling Interest) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Noncontrolling Interest [Line Items]
Net loss	$ 100	$ 30	$ 130	$ 1,887
PST Eletronica Ltda [Member]
Noncontrolling Interest [Line Items]
Noncontrolling interest at beginning of period		$ 13,762	13,762	13,310
Net loss			(130)	(1,887)
Foreign currency translation			826	2,339
Comprehensive income (loss)			696	452
Acquisition of noncontrolling interest			(14,458)
Noncontrolling interest at end of period			$ 0	$ 13,762

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income (loss) and other comprehensive income (loss), attributable to noncontrolling interests. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest).

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