Unconsolidated Subsidiaries (Narrative) (Details) - USD ($)	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016
Variable Interest Entity [Line Items]
Investments in unconsolidated subsidiaries	$ 27,254,000	$ 31,054,000	$ 30,643,000
Variable interest entity, reporting entity involvement, maximum risk of loss	5,300,000.0	4,600,000.0	4,793,000.000
Other noncurrent assets
Variable Interest Entity [Line Items]
Investments in unconsolidated subsidiaries	$ 27,300,000	$ 31,100,000	$ 30,600,000