Significant Accounting Policies (Prior Period Change in Consolidated Statement of Cash Flows) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Prepaid expenses and other assets	$ (1,734)	$ (1,583)	$ 1,370
Effect of Exchange Rate Changes on Cash	1,732	(1,575)	(1,301)
Increase in Cash, Cash Equivalents and Restricted Cash	37,424	9,452	4,251
Cash, Cash Equivalents and Restricted Cash at Beginning of Period	39,020	29,568	25,317
Cash, Cash Equivalents and Restricted Cash at End of Period	76,444	39,020	29,568
Changes Related to Adoption of ASU 2016-18 [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Prepaid expenses and other assets		42	(337)
Effect of Exchange Rate Changes on Cash		(61)	(37)
Increase in Cash, Cash Equivalents and Restricted Cash		(19)	(374)
Cash, Cash Equivalents and Restricted Cash at Beginning of Period	183	202	576
Cash, Cash Equivalents and Restricted Cash at End of Period		183	202
As Previously Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Prepaid expenses and other assets		(1,625)	1,707
Effect of Exchange Rate Changes on Cash		(1,514)	(1,264)
Increase in Cash, Cash Equivalents and Restricted Cash		9,471	4,625
Cash, Cash Equivalents and Restricted Cash at Beginning of Period	$ 38,837	29,366	24,741
Cash, Cash Equivalents and Restricted Cash at End of Period		$ 38,837	$ 29,366

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
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