Investments - Schedule of Investments (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($)
Equity Method Investment Balances [Roll Forward]
Investment in joint ventures at beginning of the period	$ 57,936
Earnings from joint ventures	207
Foreign currency translation adjustment	(221)
Investment in joint ventures at end of the period	57,922
WMES
Equity Method Investment Balances [Roll Forward]
Investment in joint ventures at beginning of the period	44,134
Earnings from joint ventures	205
Foreign currency translation adjustment	0
Investment in joint ventures at end of the period	44,339
CASC Willis
Equity Method Investment Balances [Roll Forward]
Investment in joint ventures at beginning of the period	13,802
Earnings from joint ventures	2
Foreign currency translation adjustment	(221)
Investment in joint ventures at end of the period	$ 13,583