Unaudited Condensed Consolidated Statement of Changes in Stockholders' Equity (Deficit) - 6 months ended Jun. 30, 2017 - USD ($) $ in Thousands	Total	Common stock	Additional paid-in capital	Retained earnings	Accumulated other comprehensive (loss) income
Balance at December 31, 2016 (shares) at Dec. 31, 2016	196,524,010	196,524,010
Balance at December 31, 2016 at Dec. 31, 2016	$ 146,338	$ 1,965	$ 71,420	$ 72,692	$ 261
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Other comprehensive income (loss)	$ (466)				(466)
Issuance of restricted stock (shares)	35,430
Issuance of restricted stock awards	$ 815	$ 0	815
Exercise of stock options (in shares)	567,174	567,174
Exercise of stock options	$ 3,292	$ 6	3,286
Stock-based compensation expense	1,320		1,320
Net income	$ 86,772			86,772
Balance at June 30, 2017 (shares) at Jun. 30, 2017	197,126,614	197,126,614
Balance at June 30, 2017 at Jun. 30, 2017	$ 238,071	$ 1,971	$ 76,841	$ 159,464	$ (205)