CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) Statement - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]
Common stock, issued		103,642,292				35,017,726
Additional paid-in capital			$ 739,099
Retained earnings				$ 1,228,659
Accumulated other comprehensive loss					$ 336
Total stockholders’ equity	$ 361,960	$ 10,365				$ (1,616,499)
Net income	53,514			53,514
Total other comprehensive income (loss)	(3,102)				(3,102)
Issuance of shares of common stock (in shares)		17,783
Issuance of shares of common stock, amount	935	$ 2	933
Issuance of restricted stock units and net share settlement related to withholding taxes (in shares)		57,451
Issuance of restricted stock units and net share settlement related to withholding taxes, amount	(3,394)	$ 5	(3,399)
Repurchase of common stock (in shares)						382,279
Repurchase of common stock, amount	(50,000)					$ (50,000)
Stock-based compensation	9,275		9,275
Common stock, issued		103,717,526				35,400,005
Additional paid-in capital			745,908
Retained earnings				1,282,173
Accumulated other comprehensive loss					(2,766)
Total stockholders’ equity	$ 369,188	$ 10,372				$ (1,666,499)
Common stock, issued	103,988,707	103,988,707				36,270,015
Additional paid-in capital	$ 769,411		769,411
Retained earnings	1,458,330			1,458,330
Accumulated other comprehensive loss	(5,288)				(5,288)
Total stockholders’ equity	466,353	$ 10,399				$ (1,766,499)
Net income	32,711			32,711
Total other comprehensive income (loss)	4,153				4,153
Issuance of shares of common stock (in shares)		12,943
Issuance of shares of common stock, amount	315	$ 1	314
Issuance of restricted stock units and net share settlement related to withholding taxes (in shares)		26,265
Issuance of restricted stock units and net share settlement related to withholding taxes, amount	(1,758)	$ 3	(1,761)
Repurchase of common stock (in shares)						0
Repurchase of common stock, amount	0					$ 0
Stock-based compensation	$ 6,268		6,268
Common stock, issued	104,027,915	104,027,915				36,270,015
Additional paid-in capital	$ 774,232		$ 774,232
Retained earnings	1,491,041			$ 1,491,041
Accumulated other comprehensive loss	(1,135)				$ (1,135)
Total stockholders’ equity	$ 508,042	$ 10,403				$ (1,766,499)