Accounts and Other Receivables - Net (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Receivables [Abstract]
Accounts receivables	$ 145,444	$ 188,477
Other	5,380	8,936
Total accounts and other receivables	150,824	197,413
Less – allowance for doubtful accounts	(1,725)	(1,410)
Total accounts and other receivables – net	$ 149,099	$ 196,003