Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Total
Beginning balance at Dec. 31, 2016	$ 216	$ 355,567	$ 117,853	$ 473,636
Beginning balance (in shares) at Dec. 31, 2016	21,621,000
Issuance of common stock, net	$ 39	97,301		97,340
Issuance of common stock, net, shares	3,897,000
Issuance of common stock in connection with business combination	$ 42	107,737		107,779
Issuance of common stock in connection with business combination, shares	4,176,000
Replacement award value in connection with business combination		1,149		1,149
Repurchase of common stock upon vesting of restricted stock awards	$ (2)	(4,506)		(4,508)
Repurchase of common stock upon vesting of restricted stock awards, shares	(189,000)
Forfeitures of restricted stock awards, shares	(2,000)
Stock-based compensation expense		9,542		9,542
Net income			50,295	50,295
Ending balance at Dec. 31, 2017	$ 295	566,790	168,148	735,233
Ending balance (in shares) at Dec. 31, 2017	29,503,000
Issuance of common stock, net	$ 14	30,933		30,947
Issuance of common stock, net, shares	1,439,000
Repurchase of common stock	$ (6)	(10,946)		(10,952)
Repurchase of common stock, shares	(604,000)
Repurchase of common stock upon vesting of restricted stock awards		(5,483)		(5,484)
Repurchase of common stock upon vesting of restricted stock awards, shares	(183,000)
Vesting of restricted stock	$ (1)
Stock-based compensation expense		13,743		13,743
Net income			96,455	96,455
Ending balance at Dec. 31, 2018	$ 302	595,037	264,020	859,359
Ending balance (in shares) at Dec. 31, 2018	30,155,000
Adoption of ASC 606			(583)	(583)
Issuance of common stock, net	$ 27	79,025		79,052
Issuance of common stock, net, shares	2,717,000
Repurchase of common stock	$ (1)	(1,438)		$ (1,439)
Repurchase of common stock, shares	(83,000)			(83,000)
Repurchase of common stock upon vesting of restricted stock awards	$ (1)	(3,582)		$ (3,583)
Repurchase of common stock upon vesting of restricted stock awards, shares	(152,000)
Vesting of restricted stock	$ 4	(4)
Vesting of restricted stock, shares	430,000
Stock-based compensation expense		15,316		15,316
Net income			112,994	112,994
Ending balance at Dec. 31, 2019	$ 331	$ 684,354	$ 377,014	$ 1,061,699
Ending balance (in shares) at Dec. 31, 2019	33,067,000