Deferred Class B Unit Obligation (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Obligation [Line Items]
Deferred Class B unit obligation	$ 134,894		$ 134,894
Gain on Deferred Class B unit obligation	$ 18,855		$ 6,883
Class B Units [Member]
Obligation [Line Items]
Number units to be distributed for GP Buyout
Maximum [Member] | Class B Units [Member] | GP Buyout Transaction [Member]
Obligation [Line Items]
Number units to be distributed for GP Buyout			11,600,000