Business Acquisitions (Allocation Of Purchase Price For Business Acquisitions) (Details) (USD $)	9 Months Ended
	Sep. 30, 2012		Jul. 09, 2012 Windcat Acquisition [Member]	Dec. 22, 2011 Windcat Acquisition [Member]
Business Acquisition [Line Items]
Business Acquisition, Cost of Acquired Entity, Equity Interests Issued and Issuable			$ 585,000
Trade and other receivables	18,249,000
Other current assets	16,282,000
Investments, at Equity, and Advances to 50% or Less Owned Companies	(42,358,000)
Property and Equipment	176,996,000
Intangible Assets	2,607,000
Business Acquisition, Purchase Price Allocation, Other Noncurrent Assets	(332,000)
Accounts payable	(4,701,000)
Other current liabilities	(3,508,000)
Long-Term Debt	(946,000)
Other Liabilities	(166,000)
Noncontrolling interests in subsidiaries	(13,459,000)
Accumulated Other Comprehensive Income (Loss), Net of Tax	9,000
Purchase price	148,673,000	[1]		22,100,000
Cash acquired from acquisition	$ 3,700,000

[1] Purchase price is net of cash acquired of $3.7 million and includes issued Common Stock valued at $0.6 million.