Sale of FCP (Details) (USD $)			1 Months Ended
	Sep. 30, 2011	Dec. 31, 2010	Nov. 01, 2011 Sale of First Choice [Member] First Choice [Member]	Sep. 30, 2011 First Choice [Member]	Sep. 23, 2011 First Choice [Member]	Dec. 31, 2010 First Choice [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontiuned Operations, Agreed Upon Sale Price					$ 270,000,000
Proceeds from Divestiture of Businesses			329,300,000
Current assets of business unit held for sale
Cash and cash equivalents				3,462,000		3,888,000
Accounts receivable, net of allowance for uncollectible accounts of $11,009 and $9,694				49,749,000		25,719,000
Allowance for uncollectibe accounts				11,009,000		9,694,000
Unbilled revenues				38,527,000		26,666,000
Derivative instruments				28,452,000		14,556,000
Other current assets				45,929,000		44,408,000
Current assets of business unit held for sale	166,119,000	0		166,119,000		115,237,000
Non-current assets of business unit held for sale
Net property and equipment				7,345,000		6,986,000
Goodwill and other intangible assets				69,308,000		69,439,000
Derivative instruments				8,817,000		5,264,000
Other long-term assets				15,589,000		10,718,000
Non-current assets of business unit held for sale	101,059,000	0		101,059,000		92,407,000
Current liabilities of business unit held for sale
Accounts payable				40,757,000		28,157,000
Affiliate accounts payable				6,632,000		5,001,000
Derivative instruments				39,272,000		28,297,000
Other current liabilities				17,254,000		17,085,000
Current liabilities of business unit held for sale	103,915,000	0		103,915,000		78,540,000
Non-current liabilities of business unit held for sale
Derivative instruments				14,460,000		10,823,000
Other long-term liabilities				3,136,000		4,847,000
Non-current liabilities of business unit held for sale	$ 17,596,000	$ 0		$ 17,596,000		$ 15,670,000