Accounts and Notes Receivable - Schedule of Accounts and Notes Receivable (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Short-term
Accounts and notes receivable	$ 390,184	$ 389,047
Allowance for doubtful accounts	(43,419)	(47,209)
Total net short-term accounts and notes receivable	346,765	341,838
Long-term
Notes receivable	51,956	53,043
Allowance for doubtful accounts	(10,000)	(10,000)
Total net long-term notes receivable	41,956	43,043
Total net accounts and notes receivable	$ 388,721	$ 384,881