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Derivatives - Activity in Accumulated Other Comprehensive Items (OCI) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($)
Total Stockholders' Equity [Roll Forward]
Beginning balance	$ 332,504
Ending balance	341,685
Net unrealized gain included in AOCI expected to be reclassified to earnings over the next 12 months	12
Cash Flow Hedging [Member]
Total Stockholders' Equity [Roll Forward]
Beginning balance	79
Loss (gain) reclassified to earnings	(1)
(Loss) gain recognized in AOCI	(79)
Ending balance	(1)
Cash Flow Hedging [Member] | Interest Rate Swap Agreement [Member]
Total Stockholders' Equity [Roll Forward]
Beginning balance	79
Loss (gain) reclassified to earnings	17
(Loss) gain recognized in AOCI	(97)
Ending balance	(1)
Cash Flow Hedging [Member] | Forward currency-exchange contracts [Member]
Total Stockholders' Equity [Roll Forward]
Beginning balance	0
Loss (gain) reclassified to earnings	(18)
(Loss) gain recognized in AOCI	18
Ending balance	$ 0

X

- Definition

The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount after tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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