Tax Receivable Agreement (Details) (USD $)	0 Months Ended		3 Months Ended	9 Months Ended
	Jun. 17, 2014	Jun. 01, 2011	Jun. 30, 2012	Sep. 30, 2014	Sep. 30, 2013	Jun. 17, 2014	Dec. 31, 2013	Dec. 31, 2012	Jun. 01, 2011 owner	Mar. 31, 2011
Tax Receivable Agreement [Abstract]
Percentage of cash savings from pre-initial public offering net operating loss due to pre-initial public offering stockholders			90.00%							90.00%
Tax receivable agreement, tax benefit schedule days to submission		45 days
Tax receivable agreement, number of largest owners pre initial public offering									2
Tax receivable agreement, tax benefit schedule days to response		45 days
Tax receivable agreement, tax benefit schedule days to resolve notice		30 days
Tax receivable agreement, tax benefit schedule days to payment after acceptance		5 days
Cash payment including interest to pre-IPO stockholders pursuant to tax receivable agreement			$ 27,200,000	$ 5,643,000	$ 0
Interest included in cash payment to pre-IPO stockholders pursuant to tax receivable agreement			300,000
Estimated remaining cash payment to pre-IPO stockholders						5,600,000	5,600,000	8,000,000
Tax settlement amount	7,000,000
Tax settlement interest	300,000
Excess Tax Payment Resulting From Settlement				$ 1,400,000