Significant Accounting Policies (Prior Period Change in Consolidated Statement of Cash Flows) (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Prepaid expenses and other assets	$ (1,929)	$ (1,013)
Effect of Exchange Rate Changes on Cash	(711)	1,445
Increase in Cash, Cash Equivalents and Restricted Cash	(28,905)	6,995
Cash, Cash Equivalents and Restricted Cash at Beginning of Period	76,444	39,020
Cash, Cash Equivalents and Restricted Cash at End of Period	$ 47,539	46,015
As Previously Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Prepaid expenses and other assets		(2,512)
Effect of Exchange Rate Changes on Cash		1,366
Increase in Cash, Cash Equivalents and Restricted Cash		5,417
Cash, Cash Equivalents and Restricted Cash at Beginning of Period		38,837
Cash, Cash Equivalents and Restricted Cash at End of Period		44,254
Changes Related to Adoption of ASU 2016-18 [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Prepaid expenses and other assets		1,499
Effect of Exchange Rate Changes on Cash		79
Increase in Cash, Cash Equivalents and Restricted Cash		1,578
Cash, Cash Equivalents and Restricted Cash at Beginning of Period		183
Cash, Cash Equivalents and Restricted Cash at End of Period		$ 1,761

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.

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