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Investments - Schedule of Investments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Equity Method Investment Balances [Roll Forward]
Investment in joint ventures at beginning of the period			$ 53,275
(Loss) earnings from joint ventures			(1,204)
Foreign currency translation adjustment			158
Other comprehensive gain from joint ventures	$ 157	$ 0	711	$ 0
Investment in joint ventures at end of the period	52,940		52,940
WMES
Equity Method Investment Balances [Roll Forward]
Investment in joint ventures at beginning of the period			37,365
(Loss) earnings from joint ventures			(1,513)
Foreign currency translation adjustment			0
Other comprehensive gain from joint ventures			711
Investment in joint ventures at end of the period	36,563		36,563
CASC Willis
Equity Method Investment Balances [Roll Forward]
Investment in joint ventures at beginning of the period			15,910
(Loss) earnings from joint ventures			309
Foreign currency translation adjustment			158
Other comprehensive gain from joint ventures			0
Investment in joint ventures at end of the period	$ 16,377		$ 16,377

X

- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
-Paragraph 1
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Section 50
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- Definition

Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-SubTopic 20
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- Definition

Equity Method Investment Balances [Roll Forward]

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No definition available.

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- Definition

Income (Loss) From Equity Method Investments Excluding Amortization On Deferred Gains

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- Definition

Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, before Tax, Joint Venture

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No definition available.

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