CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT) - 6 months ended Jun. 30, 2015 - USD ($) $ in Thousands	Issued Class A & B Common Stock Common Stock	Treasury Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income	Total
Balance at Dec. 31, 2014	$ 1	$ (300,017)	$ 110,317	$ 181,477		$ (8,222)
Balance (in shares) at Dec. 31, 2014	133,366,430	(11,109,285)
CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT)
Issuance of common stock upon initial public offering, net of offering costs			359,170			359,170
Issuance of common stock upon initial public offering, net of offering costs (in shares)	14,255,518
Issuance of treasury stock upon initial public offering, net of offering costs		$ 300,017	(20,115)			279,902
Issuance of treasury stock upon initial public offering, net of offering costs (in shares)		11,109,285
Stock based compensation expense			3,623			3,623
Stock based compensation expense (in shares)	71,946
Exercise of stock options			227			227
Exercise of stock options (in shares)	34,575
Tax benefit from exercise of nonqualified stock options			223			223
Other comprehensive loss					$ (1,652)	(1,652)
Net income				39,895		39,895
Balance at Jun. 30, 2015	$ 1		$ 453,445	$ 221,372	$ (1,652)	$ 673,166
Balance (in shares) at Jun. 30, 2015	147,728,469