Related Party Transactions Narrative (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
SPH Group Holding LLC
Related Party Transaction [Line Items]
Common stock - outstanding (in shares)	7,131,185
Ownership interest (as a percent)	66.10%
Affiliated Entity
Related Party Transaction [Line Items]
Related party management services fees and other arrangements	$ 8.89
Management fee term (in years)	1 year
SP Corporate
Related Party Transaction [Line Items]
Related party management services fees and other arrangements	0.10	0.10
Corporate Services Fee | Affiliated Entity
Related Party Transaction [Line Items]
Related party management services fees and other arrangements	7.15
Executive Services Fee | Affiliated Entity
Related Party Transaction [Line Items]
Related party management services fees and other arrangements	$ 1.74