Unconsolidated Subsidiaries (Narrative) (Details) - USD ($)	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016
Variable Interest Entity [Line Items]
Investments in unconsolidated subsidiaries	$ 35,906,000	$ 31,054,000	$ 29,532,000
Variable interest entity, reporting entity involvement, maximum risk of loss	6,200,000.0	4,600,000.0	3,900,000.0
Other noncurrent assets
Variable Interest Entity [Line Items]
Investments in unconsolidated subsidiaries	$ 35,900,000	$ 31,100,000	$ 29,500,000