Deferred Class B Unit Obligation (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Obligation [Line Items]
Deferred Class B unit obligation	$ 153,749		$ 153,749
Loss on Deferred Class B unit obligation	$ (6,732)		$ (11,972)
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