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Summary of Significant Accounting Policies - Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 80,044	$ 73,356	$ 78,687	$ 113,524	$ 120,357	$ 138,285
Cash equivalents	37,700		37,200
Domestic Bank Accounts
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	55,581		62,495
Foreign Bank Accounts
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	24,463		16,192
Domestic Joint Ventures
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	7,855		8,544
Foreign Joint Ventures
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	142		441
Investments in Joint Ventures
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	7,997		8,985
Cash Not Held by Joint Ventures
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 72,047		$ 69,702

X

- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes 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. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3044-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118951113&loc=d3e6676-107765

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.1)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Amount of 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. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

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-SubTopic 10
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