Condensed Consolidated Statements of Stockholders' Equity And Noncontrolling Interest - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Noncontrolling Interest [Member]	Total
Beginning balance at Dec. 31, 2018	$ 513	$ 900,795	$ (15,183)	$ (388,524)	$ (28,024)	$ 287,433	$ 469,577
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)				29,408		(6,738)	29,408
Adjustment of noncontrolling interest to redemption value				(10,420)		10,420	(10,420)
Other comprehensive income (loss), net of income taxes					109		109
Payment of dividends		168	(504)	(46,076)			(46,412)
Restricted stock units and stock options surrendered	1	(3,825)					(3,824)
Stock-based compensation expense		2,026					2,026
Ending balance at Mar. 31, 2019	514	899,164	(15,687)	(412,905)	(30,622)	291,115	440,464
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Translation adjustment related to adoption of ASU | ASU 2018-02 [Member]				2,707	(2,707)
Beginning balance at Dec. 31, 2019	549	1,185,168	(17,315)	(495,514)	(28,159)	221,511	644,729
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)				(46,516)		(4,220)	(46,516)
Adjustment of noncontrolling interest to redemption value				54,265		(54,265)	54,265
Other comprehensive income (loss), net of income taxes					(37,437)		(37,437)
Payment of dividends		147	(557)	(51,996)			(52,406)
Restricted stock units and stock options surrendered	1	(1,660)					(1,659)
Stock-based compensation expense		2,230					2,230
Ending balance at Mar. 31, 2020	$ 550	$ 1,185,885	$ (17,872)	(545,104)	(63,438)	$ 163,026	560,021
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Translation adjustment related to adoption of ASU | ASU 2016-13 [Member]				$ (5,343)	$ 2,158		$ (3,185)