CONSOLIDATED CONDENSED STATEMENT 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	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]
Share-based compensation	4,794					4,794
Acquisition of treasury stock (in shares)											(1,168)
Acquisition of treasury stock	(21,953)										$ (21,953)
Exercise of stock options (in shares)											20
Exercise of stock options	130					(203)					$ 333
Compensatory awards released from restriction	0					(19,143)					$ 19,143
Compensatory awards released from restriction (in shares)											1,112
Stock dividends	0					3			(36)		$ 33
Stock dividends (in shares)											2
Cash dividends	(1,891)								(1,891)
Equity adjustment from foreign currency translation	(6,781)									(6,781)
Change in fair value of derivative instruments, net of tax	(10,589)									(10,589)
Equity component of convertible notes, net of issuance costs and tax	57,077					57,077
Premiums paid for capped call confirmations, net of tax	(24,513)					(24,513)
Net income (loss)	(138,790)								(138,790)
Balance at end of period (in shares) at Jun. 30, 2020				95,649							1,485
Balance at end of period at Jun. 30, 2020	$ 624,548			$ 956		341,615			348,376	(39,792)	$ (26,607)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends (in dollars per share)	$ 0.01
Balance at beginning of period (in shares) at Mar. 31, 2020				95,649							1,541
Balance at beginning of period at Mar. 31, 2020	$ 759,967			$ 956		307,133			517,004	(37,517)	$ (27,609)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	2,933					2,933
Acquisition of treasury stock (in shares)											(1)
Acquisition of treasury stock	(15)										$ (15)
Compensatory awards released from restriction	0					(1,014)					$ 1,014
Compensatory awards released from restriction (in shares)											57
Stock dividends	0					(1)			(2)		$ 3
Cash dividends	(942)								(942)
Equity adjustment from foreign currency translation	8,155									8,155
Change in fair value of derivative instruments, net of tax	(10,430)									(10,430)
Equity component of convertible notes, net of issuance costs and tax	57,077					57,077
Premiums paid for capped call confirmations, net of tax	(24,513)					(24,513)
Net income (loss)	(167,684)								(167,684)
Balance at end of period (in shares) at Jun. 30, 2020				95,649							1,485
Balance at end of period at Jun. 30, 2020	$ 624,548			$ 956		341,615			348,376	(39,792)	$ (26,607)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cash dividends (in dollars per share)	$ 0.01
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]
Stock issued during period, shares, acquisitions (in shares)				89,776	188
Stock issued during period, value, acquisitions	2,650,201		$ 0	$ 898	$ 2	2,649,303		$ (2)
Share-based compensation	15,648	$ 33,051				15,648	$ 33,051
Acquisition of treasury stock (in shares)											(409)
Acquisition of treasury stock	(12,538)					253					$ (12,791)
Exercise of stock options (in shares)				327							909
Exercise of stock options	18,403			$ 3		(1,901)					$ 20,301
Compensatory awards released from restriction	0					(18,315)					$ 18,315
Compensatory awards released from restriction (in shares)											942
Stock dividends	0					13			(37)		$ 24
Stock dividends (in shares)											1
Cash dividends	(3)								(3)
Equity adjustment from foreign currency translation	(10,277)									(10,277)
Change in fair value of derivative instruments, net of tax	5,129									5,129
Net income (loss)	364,205								364,205
Balance at end of period (in shares) at Jun. 30, 2021				185,940							3
Balance at end 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]
Cash dividends (in dollars per share)	$ 0.01
Balance at beginning of period (in shares) at Mar. 31, 2021				185,613							941
Balance at beginning of period at Mar. 31, 2021	$ 3,612,819			$ 1,856		3,016,902			632,650	(17,446)	$ (21,143)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based compensation	11,039					11,039
Acquisition of treasury stock (in shares)											(9)
Acquisition of treasury stock	(37)					253					$ (290)
Exercise of stock options (in shares)				327							869
Exercise of stock options	18,146			$ 3		(1,449)					$ 19,592
Compensatory awards released from restriction	0					(1,750)					$ 1,750
Compensatory awards released from restriction (in shares)											78
Stock dividends	0								(1)		$ 1
Equity adjustment from foreign currency translation	5,966									5,966
Change in fair value of derivative instruments, net of tax	(214)									(214)
Net income (loss)	91,744								91,744
Balance at end of period (in shares) at Jun. 30, 2021				185,940							3
Balance at end of period at Jun. 30, 2021	$ 3,739,463			$ 1,859		$ 3,024,995			$ 724,393	$ (11,694)	$ (90)