Unconsolidated Subsidiaries (Narrative) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015 Subsidiaries	Dec. 31, 2014	Mar. 31, 2014
Variable Interest Entity [Line Items]
Number of wholly owned subsidiaries	2
Variable interest entity, reporting entity involvement, maximum risk of loss	$ 4,000,000	$ 4,000,000	$ 5,300,000
Accounts receivable from affiliates	2,119,000	57,421,000	32,247,000
Coyote Creek
Variable Interest Entity [Line Items]
Accounts receivable from affiliates		53,200,000	29,600,000
Other noncurrent assets
Variable Interest Entity [Line Items]
Investment in unconsolidated operations and related tax position	$ 31,200,000	$ 28,200,000	$ 34,100,000