Geographic Areas (Schedule Of Segment Reporting - Revenues) (Details) (USD $) In Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Products	$ 114,479	$ 122,188	$ 234,663	$ 244,021
Services	22,515	19,812	39,998	40,512
Intercompany	18,664	15,391	27,575	30,947
Eliminations revenue	(18,664)	(15,391)	(27,575)	(30,947)
Total	136,994	142,000	274,661	284,533
Eliminations income (loss) before income taxes	274	4,151	745	7,700
Income (loss) before income taxes	30,503	39,381	61,186	74,013
Western Hemisphere [Member]
Products	49,435	77,201	128,877	146,670
Services	8,682	9,883	15,655	20,635
Intercompany	18,535	15,021	27,110	27,617
Total	76,652	102,105	171,642	194,922
Income (loss) before income taxes	11,926	22,774	33,555	33,478
Eastern Hemisphere [Member]
Products	49,947	27,271	76,909	62,089
Services	9,429	6,959	16,177	15,133
Intercompany	121	241	457	1,578
Total	59,497	34,471	93,543	78,800
Income (loss) before income taxes	12,418	5,467	16,496	15,004
Asia - Pacific [Member]
Products	15,097	17,716	28,877	35,262
Services	4,404	2,970	8,166	4,744
Intercompany	8	129	8	1,752
Total	19,509	20,815	37,051	41,758
Income (loss) before income taxes	$ 5,885	$ 6,989	$ 10,390	$ 17,831

Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 1
-Article 5

+ Details

Name:	us-gaap_SalesRevenueGoodsNet
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 03
-Paragraph 1
-Article 5

+ Details

Name:	us-gaap_SalesRevenueServicesNet
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Consolidated entity revenues.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 131
-Paragraph 32
-Subparagraph a

+ Details

Name:	us-gaap_SegmentReportingEntityConsolidatedRevenue
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of income or loss for the reportable segment before income taxes and extraordinary items.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 131
-Paragraph 27

+ Details

Name:	us-gaap_SegmentReportingInformationIncomeLossBeforeIncomeTaxes
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of revenue from transactions with other operating segments of the same entity. Must be disclosed if the amount (a) is included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) is otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 131
-Paragraph 27
-Subparagraph b

+ Details

Name:	us-gaap_SegmentReportingInformationIntersegmentRevenue
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Total of reconciling items from segment operating profit or loss to consolidated income before income taxes, extraordinary items, discontinued operations, and the cumulative effect of changes in accounting principles.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 131
-Paragraph 32
-Subparagraph b

+ Details

Name:	us-gaap_SegmentReportingReconcilingItemsForOperatingProfitLoss
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Total of reconciling items between total reportable segments' revenues and consolidated entity revenues.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 131
-Paragraph 32
-Subparagraph a

+ Details

Name:	us-gaap_SegmentReportingReconcilingItemsRevenue
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration