Accounts Receivable (Accounts Receivable Of Continuing Operations) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Accounts Receivable Additional Disclosures [Abstract]
Trade	$ 74,514	$ 64,707
Allowance for doubtful accounts	(2,151)	(1,417)
Accounts receivable, net, current, total	72,363	63,290
Other	4,219	3,342
Total accounts and other receivables	$ 76,582	$ 66,632