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Derivatives - Activity in Accumulated Other Comprehensive Items (OCI) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($)
Total Stockholders' Equity [Roll Forward]
Beginning balance	$ 332,504
Ending balance	345,227
Net unrealized gain included in AOCI expected to be reclassified to earnings over the next 12 months	85
Cash Flow Hedging [Member]
Total Stockholders' Equity [Roll Forward]
Beginning balance	79
Loss reclassified to earnings	4
Gain recognized in AOCI	89
Ending balance	172
Cash Flow Hedging [Member] | Interest Rate Swap Agreement [Member]
Total Stockholders' Equity [Roll Forward]
Beginning balance	79
Loss reclassified to earnings	4
Gain recognized in AOCI	71
Ending balance	154
Cash Flow Hedging [Member] | Foreign Exchange Forward [Member]
Total Stockholders' Equity [Roll Forward]
Beginning balance	0
Loss reclassified to earnings	0
Gain recognized in AOCI	18
Ending balance	$ 18

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 55
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=84158357&loc=d3e1436-108581

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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e689-108580

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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