SCHEDULE V - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	$ 3,948	$ 5,976	$ 3,079
Additions Amounts Charged to Expense	11,421	2,454	3,453
Deductions Amounts Written Off or Disposals	(2,529)	(4,482)	(556)
Balance at End of Period	12,840	3,948	5,976
Allowance for Doubtful Accounts
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	3,948	2,757	2,136
Additions Amounts Charged to Expense	2,523	1,504	1,029
Deductions Amounts Written Off or Disposals	(812)	(313)	(408)
Balance at End of Period	5,659	3,948	2,757
Allowance for Credit Losses on Bank Loans
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period	0	3,219	943
Additions Amounts Charged to Expense	8,898	950	2,424
Deductions Amounts Written Off or Disposals	(1,717)	(4,169)	(148)
Balance at End of Period	$ 7,181	$ 0	$ 3,219