Unconsolidated Subsidiaries (Narrative) (Details)	3 Months Ended
	Mar. 31, 2016 USD ($) subsidiary	Dec. 31, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Variable Interest Entity [Line Items]
Number of wholly owned subsidiaries | subsidiary	2
Variable interest entity, reporting entity involvement, maximum risk of loss	$ 3,894,000.000	$ 4,000,000.0	$ 4,000,000.0
Accounts receivable from affiliates	4,590,000	3,085,000	2,119,000
Coyote Creek
Variable Interest Entity [Line Items]
Accounts receivable from affiliates				$ 53,200,000
Other noncurrent assets
Variable Interest Entity [Line Items]
Investment in unconsolidated operations and related tax position	29,500,000	$ 24,600,000	$ 31,200,000
Loans receivable
Variable Interest Entity [Line Items]
Variable interest entity, reporting entity involvement, maximum risk of loss	$ 1,000,000.0