Schedule II - Valuation and Qualifying Accounts - Summary of the Deferred Tax Assets Valuation Allowance and Allowance for Doubtful Accounts Receivable (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]
Balance at beginning of year	$ 27,865	$ 7,242	$ 31,751
Additions	7,396	22,770	617
Deductions	2,911	2,147	25,126
Balance at end of year	32,350	27,865	7,242
SEC Schedule, 12-09, Allowance, Loan and Lease Loss [Member]
Balance at beginning of year	1,257	9	21
Additions	1,361	1,880	14
Deductions	1,264	632	26
Balance at end of year	$ 1,354	$ 1,257	$ 9