Tax Receivable Agreement (Details) $ in Thousands			3 Months Ended	12 Months Ended
	Jun. 17, 2014 USD ($)	Mar. 31, 2011 owner	Jun. 30, 2012 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Jun. 01, 2011
Tax Receivable Agreement [Abstract]
Percentage of cash savings from pre-IPO NOLs due to pre-IPO stockholders								90.00%
Tax receivable agreement, tax benefit schedule days to submission		45 days
Tax receivable agreement, number of largest owners pre initial public offering | owner		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
Payments to pre-IPO shareholders pursuant to tax receivable agreement			$ 27,200	$ 0	$ 5,643	$ 0
Interest included in cash payment to pre-IPO stockholders pursuant to tax receivable agreement			$ 300
Estimated remaining cash payment to pre-IPO stockholders	$ 5,600					$ 5,643	$ 8,000
Settlement amount	7,000
Settlement, interest expense	$ 300
Excess tax payment resulting from settlement					$ 1,400