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Summary of Significant Accounting Policies - Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 78,687	$ 138,285	$ 112,183	$ 128,771
Cash equivalents	37,200	7,100
Held in Domestic Bank Accounts
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	62,495	83,074
Held in Foreign Bank Accounts
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	16,192	55,211
Held by Joint Ventures
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	8,985	16,657
Held by Domestic Joint Ventures
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	8,544	10,042
Held by Foreign Joint Ventures
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	441	6,615
Not Held by Joint Ventures
Cash and Cash Equivalents [Line Items]
Cash and cash equivalents	$ 69,702	$ 121,628

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=109223946&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=82887183&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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-Paragraph 1
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