New Accounting Pronouncements Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash and cash equivalents	$ 7,965	$ 26,616	$ 6,768
Total cash, cash equivalents and restricted cash shown in the statement of cash flows	19,108	36,761	16,070	$ 41,296
Subsidiaries [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash and cash equivalents	5,640	25,864	5,939
Total cash, cash equivalents and restricted cash shown in the statement of cash flows	$ 16,783	$ 36,009	$ 15,241	$ 40,899