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Investments - Summarized Financial Information (Details) - WMES - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Income Statement [Abstract]
Revenue	$ 13,594	$ 9,040	$ 23,137	$ 16,646
Expenses	9,516	7,551	17,721	14,354
WMES income before income taxes	4,078	$ 1,489	5,416	$ 2,292
Statement of Financial Position [Abstract]
Total assets	315,173		315,173		$ 274,744
Total liabilities	230,759		230,759		198,534
Total WMES net equity	$ 84,414		$ 84,414		$ 76,210

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