Unaudited Consolidated Condensed Statement of Changes in Stockholders' Equity - 6 months ended Jun. 30, 2018 - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Earnings	Accumulated Other Comprehensive Loss	Non-Controlling Interest
Beginning balance (in shares) at Dec. 31, 2017	72,393,933	72,393,933
Beginning balance at Dec. 31, 2017	$ 147,976	$ 723	$ 5,350	$ 148,887	$ (10,848)	$ 3,864
Cumulative adjustment from implementation of ASC 606 at Dec. 31, 2017	842			858		(16)
Changes in Stockholders’ Equity
Share-based compensation recognized	7,322		7,322
Restricted stock units delivered, net of cashless (in shares)		323,205
Restricted stock units delivered, net of cashless	(2,014)	$ 4	(2,018)
Net income	43,247			43,074		173
Other comprehensive loss	$ (10)				(10)
Ending balance (in shares) at Jun. 30, 2018	72,717,138	72,717,138
Ending balance at Jun. 30, 2018	$ 197,363	$ 727	$ 10,654	$ 192,819	$ (10,858)	$ 4,021