Investments In and Advances to Equity Method Investees - Schedule of Assets and Liabilities and Maximum Loss Exposure of Unconsolidated VIEs (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Jan. 20, 2020	Dec. 31, 2019
Passport
ASSETS
Current assets	$ 239,957		$ 271,894
Non current assets	603		577
Total assets	240,560		272,471
Liabilities
Current liabilities	145,745		181,206
Non current liabilities	36		40
Total liabilities	145,781		181,246
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure [Abstract]
Investment carrying value	69,907		70,000
Loan and interest receivable	42,037		41,387
Guarantee	25,000		25,000
Maximum exposure	136,944		136,387
Minimum risk-based capital requirement		150.00%
Global Health
ASSETS
Current assets	53,680		50,729
Non current assets	35,610		39,259
Total assets	89,290		89,988
Liabilities
Current liabilities	54,618		55,442
Non current liabilities	44,716		44,650
Total liabilities	99,334		100,092
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure [Abstract]
Investment carrying value	0		46,456
Loan and interest receivable	0		0
Guarantee	0		0
Maximum exposure	$ 0		$ 46,456