Business and Segment Reporting (Reconciliation of Assets of Segments to Consolidated Amounts) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Segment Reporting Information [Line Items]
Adjusted total assets	$ 1,699,817		$ 1,757,701
Cash and cash equivalents	68,383	$ 58,313	91,547
Other unallocated amounts	4,510		5,145
Total assets	1,828,549	$ 1,848,601	1,886,706
Other Segments [Member]
Segment Reporting Information [Line Items]
Adjusted total assets	$ 120,415		$ 112,347