Consolidated Statements of Equity Statement - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Common Stock Including Additional Paid in Capital [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Parent [Member]	Noncontrolling Interest [Member]
Beginning balance (in shares) at Dec. 31, 2019		39,941
Beginning balance at Dec. 31, 2019	$ 800,815		$ 1,357,600	$ (204,672)	$ (376,390)	$ 776,538	$ 24,277
Net income	9,162				8,684	8,684	478
Other comprehensive income (loss), net of tax	(25,211)			(25,211)		(25,211)
Net stock issuance and repurchases (in shares)		235
Net stock issued and repurchased	2,247		2,247			2,247
Stock-based compensation expense	8,482		8,482			8,482
Proceeds from sale of warrants	0
Ending balance at Mar. 31, 2020	$ 795,495		1,368,329	(229,883)	(367,706)	770,740	24,755
Ending balance (in shares) at Mar. 31, 2020		40,176
Beginning balance (in shares) at Dec. 31, 2020	40,444	40,444
Beginning balance at Dec. 31, 2020	$ 840,273		1,389,419	(138,526)	(434,345)	816,548	23,725
Net income	13,580				12,603	12,603	977
Other comprehensive income (loss), net of tax	(11,783)			(11,783)		(11,783)
Net stock issuance and repurchases (in shares)		206
Net stock issued and repurchased	2,009		2,009			2,009
Stock-based compensation expense	6,270		6,270			6,270
Stock issued related to equity offering (in shares)	389,419		389,419			389,419
Stock issued related to equity offering		4,472
Proceeds from sale of warrants	45,349		45,349			45,349
Purchases of convertible note hedge contracts, net of tax	(63,576)		(63,576)			(63,576)
Registration fee	(373)		(373)			(373)
Ending balance at Mar. 31, 2021	$ 1,221,168		$ 1,768,517	$ (150,309)	$ (421,742)	$ 1,196,466	$ 24,702
Ending balance (in shares) at Mar. 31, 2021	45,122	45,122