Accounts Receivables - SWIMS Factoring Agreement (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Accounts Receivable
Insured receivables sold	$ 486,122	$ 380,595
Uninsured receivables sold	39,665	43,630
Total receivables sold	525,787	424,225
Purchase price of sold receivables	(423,000)	(364,900)
Allowances	(17,337)	(25,500)
Sold receivables, net	85,450	33,825
Accounts receivable, net	$ 18,197	$ 27,910