CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Treasury Stock at Cost	Retained Earnings	Cumulative effect	Cumulative effect Retained Earnings
Beginning balance at Dec. 31, 2018	$ 1,071,140	$ 202	$ 761,301	$ (23,130)	$ (70,362)	$ 403,129
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	6,815					6,815
Other comprehensive income (loss), net	177			177
Stock-based compensation and net issuance of common stock for share vesting	6,377		6,377
Exercise of stock options	306	1	305
Common stock repurchases and related expenses	(4,171)				(4,171)
Ending balance at Mar. 31, 2019	1,080,644	203	767,983	(22,953)	(74,533)	409,944
Beginning balance at Dec. 31, 2018	1,071,140	202	761,301	(23,130)	(70,362)	403,129
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(106,846)
Other comprehensive income (loss), net	1,054
Ending balance at Jun. 30, 2019	967,221	204	768,046	(22,076)	(75,236)	296,283
Beginning balance at Dec. 31, 2018	1,071,140	202	761,301	(23,130)	(70,362)	403,129
Ending balance at Dec. 31, 2019	$ 696,122	205	775,707	(58,616)	(107,984)	86,810	$ (440)	$ (440)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Beginning balance at Mar. 31, 2019	$ 1,080,644	203	767,983	(22,953)	(74,533)	409,944
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(113,661)					(113,661)
Other comprehensive income (loss), net	877			877
Stock-based compensation and net issuance of common stock for share vesting	(545)		(545)
Exercise of stock options	590	1	589
Warrant exercises	19		19
Common stock repurchases and related expenses	(703)				(703)
Ending balance at Jun. 30, 2019	967,221	204	768,046	(22,076)	(75,236)	296,283
Beginning balance at Dec. 31, 2019	696,122	205	775,707	(58,616)	(107,984)	86,810	(440)	(440)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(39,808)					(39,808)
Other comprehensive income (loss), net	(4,010)			(4,010)
Stock-based compensation and net issuance of common stock for share vesting	900		900
Common stock repurchases and related expenses	1,071				1,071
Ending balance at Mar. 31, 2020	653,835	205	776,607	(62,626)	(106,913)	46,562
Beginning balance at Dec. 31, 2019	696,122	205	775,707	(58,616)	(107,984)	86,810	$ (440)	$ (440)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(278,109)
Other comprehensive income (loss), net	(11,131)
Ending balance at Jun. 30, 2020	409,415	206	777,650	(69,747)	(106,955)	(191,739)
Beginning balance at Mar. 31, 2020	653,835	205	776,607	(62,626)	(106,913)	46,562
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(238,301)					(238,301)
Other comprehensive income (loss), net	(7,121)			(7,121)
Stock-based compensation and net issuance of common stock for share vesting	1,044	1	1,043
Common stock repurchases and related expenses	(42)				(42)
Ending balance at Jun. 30, 2020	$ 409,415	$ 206	$ 777,650	$ (69,747)	$ (106,955)	$ (191,739)