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Intangible Asset and Goodwill (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2017 USD ($)
Goodwill [Roll Forward]
Beginning Balance	$ 204,794
Additions to Goodwill	803
Impairment Charge of Goodwill	0
Ending Balance	207,959
Goodwill, Translation Adjustments	2,362
MID Segment
Goodwill [Roll Forward]
Beginning Balance	66,643
Additions to Goodwill	0
Impairment Charge of Goodwill	0
Ending Balance	66,643
Goodwill, Translation Adjustments	0
RSD Segment
Goodwill [Roll Forward]
Beginning Balance	138,151
Impairment Charge of Goodwill	0
Ending Balance	141,316
Goodwill, Translation Adjustments	2,362
Other
Goodwill [Roll Forward]
Ending Balance	0
Goodwill [Member] | RSD Segment
Goodwill [Roll Forward]
Additions to Goodwill	$ 803

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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-Section 50
-Paragraph 1
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- Definition

Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Paragraph 28
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