Significant Accounting Policies (Prior Period Change in Consolidated Statement of Cash Flows) (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Prepaid expenses and other assets	$ (381)	$ 444
Effect of Exchange Rate Changes on Cash	(220)	320
Increase in Cash, Cash Equivalents and Restricted Cash	(8,714)	914
Cash, Cash Equivalents and Restricted Cash at Beginning of Period	76,444	39,020
Cash, Cash Equivalents and Restricted Cash at End of Period	$ 67,730	39,934
Changes Related to Adoption of ASU 2016-18 [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Prepaid expenses and other assets		(6)
Effect of Exchange Rate Changes on Cash		14
Increase in Cash, Cash Equivalents and Restricted Cash		8
Cash, Cash Equivalents and Restricted Cash at Beginning of Period		183
Cash, Cash Equivalents and Restricted Cash at End of Period		191
As Previously Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Prepaid expenses and other assets		450
Effect of Exchange Rate Changes on Cash		306
Increase in Cash, Cash Equivalents and Restricted Cash		906
Cash, Cash Equivalents and Restricted Cash at Beginning of Period		38,837
Cash, Cash Equivalents and Restricted Cash at End of Period		$ 39,743

Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 24
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3521-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Section 50
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Topic 230
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-Section 45
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Amount of increase (decrease) in cash, cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 230
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-URI http://asc.fasb.org/extlink&oid=98513438&loc=d3e33268-110906

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Amount of increase (decrease) from effect of exchange rate changes on cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; held in foreign currencies. Excludes amounts for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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