Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Retained Earnings [Member]
Beginning Balance at Dec. 31, 2018	$ 2,067,964	$ 306	$ (204,501)	$ 736,035	$ (3,832)	$ 1,539,956
Net Income	57,158	0	0	0	0	57,158
Other comprehensive income	520	0	0	0	520	0
Stock-based compensation	10,025	0	0	10,025	0	0
Issuance of warrants	669	0	0	669	0	0
Treasury shares of 206 withheld for payment of taxes	(9,227)	0	(9,227)	0	0	0
Issuance of shares of restricted stock	0	4	0	(4)	0	0
Ending Balance at Jun. 30, 2019	2,127,109	310	(213,728)	746,725	(3,312)	1,597,114
Beginning Balance at Mar. 31, 2019	2,034,949	310	(213,690)	741,652	(3,569)	1,510,246
Net Income	86,868	0	0	0	0	86,868
Other comprehensive income	257	0	0	0	257	0
Stock-based compensation	4,404	0	0	4,404	0	0
Issuance of warrants	669	0	0	669	0	0
Treasury shares of 206 withheld for payment of taxes	(38)	0	(38)	0	0	0
Issuance of shares of restricted stock	0	0	0	0	0	0
Ending Balance at Jun. 30, 2019	2,127,109	310	(213,728)	746,725	(3,312)	1,597,114
Beginning Balance at Dec. 31, 2019	1,792,179	310	(213,871)	761,715	(2,818)	1,246,843
Net Income	102,265	0	0	0	0	102,265
Other comprehensive income	471	0	0	0	471	0
Stock-based compensation	10,506	0	0	10,506	0	0
Issuance of warrants	28,786	0	0	28,786	0	0
Treasury shares of 206 withheld for payment of taxes	(3,840)	0	(3,840)	0	0	0
Issuance of shares of restricted stock	0	5	0	(5)	0	0
Ending Balance at Jun. 30, 2020	1,930,367	315	(217,711)	801,002	(2,347)	1,349,108
Beginning Balance at Mar. 31, 2020	1,832,750	315	(217,705)	782,517	(2,573)	1,270,196
Net Income	78,912	0	0	0	0	78,912
Other comprehensive income	226	0	0	0	226	0
Stock-based compensation	6,646	0	0	6,646	0	0
Issuance of warrants	11,840	0	0	11,840	0	0
Treasury shares of 206 withheld for payment of taxes	(6)	0	(6)	0	0	0
Issuance of shares of restricted stock	(1)	0	0	(1)	0	0
Ending Balance at Jun. 30, 2020	$ 1,930,367	$ 315	$ (217,711)	$ 801,002	$ (2,347)	$ 1,349,108