Organization and Significant Accounting Policies - Initial Public Offering (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended		12 Months Ended
	Dec. 31, 2014	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2013
Class of Stock [Line Items]
Issuance of stock, net of issuance costs	$ 90,427			$ 7,145
Underwriting discounts and commissions			$ 4
Class A Common Stock | IPO
Class of Stock [Line Items]
Issuance of stock (in shares)		7,200,000
Share price (in dollars per share)	$ 14.00	$ 14.00
Issuance of stock, net of issuance costs		$ 90,400
Underwriting discounts and commissions		7,100
Payment of equity issuance costs		$ 3,300