CONSOLIDATED CONDENSED STATEMENTS OF SHAREHOLDERS' EQUITY (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Restricted Stock	Options and Restricted Stock	Common Stock	Common Stock Options and Restricted Stock	Additional Paid-in Capital	Additional Paid-in Capital Restricted Stock	Additional Paid-in Capital Options and Restricted Stock	Retained Earnings	Accumulated Other Comprehensive (Loss) Income	Treasury Stock
Balance at beginning of period (in shares) at Dec. 31, 2019				95,649							1,451
Balance at beginning of period at Dec. 31, 2019	$ 767,353			$ 956		$ 323,600			$ 489,382	$ (22,422)	$ (24,163)
Balance at beginning of period (ASU 2016-13 (Topic 326)) at Dec. 31, 2019	(289)								(289)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Acquisition of treasury stock	(22,143)										$ (22,143)
Acquisition of treasury stock (in shares)											(1,178)
Share-based compensation	8,066					8,066
Exercise of stock options (in shares)											20
Exercise of stock options	130					(203)					$ 333
Compensatory awards released from restriction (in shares)											1,138
Compensatory awards released from restriction	0					(19,609)					$ 19,609
Stock dividends	0					4			(39)		$ 35
Stock dividends (in shares)											2
Cash dividends	(1,891)								(1,891)
Equity adjustment from foreign currency translation	2,347									2,347
Change in fair value of derivative instruments, net of tax	(11,248)									(11,248)
Equity component of convertible notes, net of issuance costs and tax	57,080					57,080
Premiums paid for capped call confirmations, net of tax	(24,513)					(24,513)
Net income (loss)	(86,358)								(86,358)
Balance at end of period (in shares) at Sep. 30, 2020				95,649							1,469
Balance at end of period at Sep. 30, 2020	688,534			$ 956		344,425			400,805	(31,323)	$ (26,329)
Balance at beginning of period (in shares) at Jun. 30, 2020				95,649							1,485
Balance at beginning of period at Jun. 30, 2020	624,548			$ 956		341,615			348,376	(39,792)	$ (26,607)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Acquisition of treasury stock	(190)										$ (190)
Acquisition of treasury stock (in shares)											(10)
Share-based compensation	3,272					3,272
Compensatory awards released from restriction (in shares)											26
Compensatory awards released from restriction	0					(466)					$ 466
Stock dividends	0					1			(3)		$ 2
Equity adjustment from foreign currency translation	9,128									9,128
Change in fair value of derivative instruments, net of tax	(659)									(659)
Equity component of convertible notes, net of issuance costs and tax	3					3
Net income (loss)	52,432								52,432
Balance at end of period (in shares) at Sep. 30, 2020				95,649							1,469
Balance at end of period at Sep. 30, 2020	688,534			$ 956		344,425			400,805	(31,323)	$ (26,329)
Balance at beginning of period (in shares) at Dec. 31, 2020				95,649							1,446
Balance at beginning of period at Dec. 31, 2020	675,644			$ 956		346,945			360,228	(6,546)	$ (25,939)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Acquisition of treasury stock	(12,938)					331					$ (13,269)
Acquisition of treasury stock (in shares)											(426)
Common stock issued during period (in shares)				89,776	188
Common stock issued during period	2,650,201		$ 0	$ 898	$ 2	2,649,303		$ (2)
Share-based compensation	27,113	$ 33,051				27,113	$ 33,051
Exercise of stock options (in shares)				379							911
Exercise of stock options	19,520			$ 4		(836)					$ 20,352
Compensatory awards released from restriction (in shares)				39							943
Compensatory awards released from restriction	0					(18,320)					$ 18,320
Stock dividends	0					24			(48)		$ 24
Stock dividends (in shares)											1
Cash dividends	(3)								(3)
Equity adjustment from foreign currency translation	(23,206)									(23,206)
Change in fair value of derivative instruments, net of tax	4,330									4,330
Net income (loss)	348,214								348,214
Balance at end of period (in shares) at Sep. 30, 2021				186,031							17
Balance at end of period at Sep. 30, 2021	3,721,926			$ 1,860		3,037,609			708,391	(25,422)	$ (512)
Balance at beginning of period (in shares) at Jun. 30, 2021				185,940							3
Balance at beginning of period at Jun. 30, 2021	3,739,463			$ 1,859		3,024,995			724,393	(11,694)	$ (90)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Acquisition of treasury stock	(400)					78					$ (478)
Acquisition of treasury stock (in shares)											(17)
Share-based compensation	11,465					11,465
Exercise of stock options (in shares)				52							2
Exercise of stock options	1,117			$ 1		1,065					$ 51
Compensatory awards released from restriction (in shares)				39							1
Compensatory awards released from restriction	0					(5)					$ 5
Stock dividends	0					11			(11)		$ 0
Equity adjustment from foreign currency translation	(12,929)									(12,929)
Change in fair value of derivative instruments, net of tax	(799)									(799)
Net income (loss)	(15,991)								(15,991)
Balance at end of period (in shares) at Sep. 30, 2021				186,031							17
Balance at end of period at Sep. 30, 2021	$ 3,721,926			$ 1,860		$ 3,037,609			$ 708,391	$ (25,422)	$ (512)