CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Retained Earnings	Accumulated Other Comprehensive Income
Balance at Dec. 31, 2014	$ 199,592	$ 169	$ 147,474	$ 51,431	$ 518
Balance (in shares) at Dec. 31, 2014		16,903,884
Increase (Decrease) in Stockholders' Equity
Net income	17,450			17,450
Other comprehensive income	161				161
Share-based compensation expense	670		670
Common stock issued	72,252	$ 45	72,207
Common stock issued (in shares)		4,480,645
Warrants exercised	689	$ 1	688
Warrant exercise (in shares)		125,316
Repurchase of common stock	(116)		(116)
Repurchase of common stock (in shares)		(7,165)
Exercise of stock options	69	$ 0	69
Exercise of stock options (in shares)		7,998
Balance at Sep. 30, 2015	290,767	$ 215	220,992	68,881	679
Balance (in shares) at Sep. 30, 2015		21,510,678
Balance at Dec. 31, 2015	$ 298,980	$ 215	221,487	76,946	332
Balance (in shares) at Dec. 31, 2015	21,570,746	21,570,746
Increase (Decrease) in Stockholders' Equity
Net income	$ 28,152			28,152
Other comprehensive income	1,031				1,031
Share-based compensation expense	1,831		1,831
Issuance of restricted stock (in shares)		218,236
Common stock issued	119,383	$ 58	119,325
Common stock issued (in shares)		5,815,051
Exercise of stock options	588		588
Exercise of stock options (in shares)		52,500
Balance at Sep. 30, 2016	$ 449,965	$ 273	$ 343,231	$ 105,098	$ 1,363
Balance (in shares) at Sep. 30, 2016	27,656,533	27,656,533