Investments In and Advances to Equity Method Investees - Schedule of Assets and Liabilities and Maximum Loss Exposure of Unconsolidated VIEs (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Passport
ASSETS
Current assets	$ 271,894
Non current assets	577
Total assets	272,471
Liabilities
Current liabilities	181,206
Non current liabilities	40
Total liabilities	181,246
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure [Abstract]
Investment carrying value	70,000
Loan and interest receivable	41,387
Guarantee	25,000
Maximum exposure	$ 136,387
Global Health
ASSETS
Current assets		$ 50,729
Non current assets		39,259
Total assets		89,988
Liabilities
Current liabilities		55,442
Non current liabilities		44,650
Total liabilities		100,092
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure [Abstract]
Investment carrying value		46,456
Loan and interest receivable		0
Guarantee		0
Maximum exposure		$ 46,456